前綴 sub-(suc-,suf-,sug-,sum-,sup-,sur-,sus-) = under
前綴sub-來源拉介詞sub,意為“under,from under”等，表示“在下”的位置或“自下而上”的運(yùn)動(dòng)。作為原生前綴，sub-出現(xiàn)在許多12世紀(jì)后引進(jìn)的拉丁借詞中，sub-依然遵守拉丁讀音規(guī)則，接受詞根首字母的同化產(chǎn)生出suc-,suf-,sug-,sum-,sup-,sur-,sus-,su-等變形異體。但在16世紀(jì)以后，sub-可作為活性派生詞綴與各種語源的單詞結(jié)合構(gòu)成新詞。在這些派生詞中，sub-沒有異體，而意思卻有所引申。除under之外，它還可以表示“secondary, slightly,in place of, precisely"等含義。派生前綴sub-可以與名詞、形容詞、動(dòng)詞等結(jié)合。當(dāng)他作為介詞性前綴與名詞結(jié)合時(shí)，可能改變?cè)~基單詞的詞性。與包含sub- 的拉丁借詞相比，由派生前綴sub- 構(gòu)成單詞數(shù)量更多。
另一詞源：劉毅英語字根字典介紹前綴sub-是由sup-演變而來，其比較級(jí)為super,最高級(jí)是supreme,Sub-原味“高”的意思，如super,supreme是指“以上；極度；超越”之意。依照sub-本來的意思“高”演變而來的自由sublime（崇高的；是崇高）。變化形：suc-,suf-,sug-,sum-,sur-,sus-" 。
英語詞源：
word-forming element meaning "under, beneath; behind; from under; resulting from further division," from Latin preposition sub "under, below, beneath, at the foot of," also "close to, up to, towards;" of time, "within, during;" figuratively "subject to, in the power of;" also "a little, somewhat" (e.g. sub-horridus "somewhat rough").
This is said to be from PIE *(s)up- (perhaps representing *ex-upo-), a variant form of the root *upo- "from below," hence "turning upward, upward, up, up from under, over, beyond" (cf. Sanskrit upa "near,under, up to, on," Greek hypo "under," Gothic iup, Old Norse, Old English upp "up, upward," Hittite up-zi "rises"). The Latin word also was used as a prefix and in various combinations.
In Latin assimilated to following -c-, -f-, -g-, -p-, and often -r- and -m-. In Old French the prefix appears in the full Latin form only "in learned adoptions of old Latin compounds" [OED], and in popular use it was represented by sous-, sou-; cf. French souvenir from Latin subvenire, souscrire (Old French souzescrire) from subscribere, etc.
The original meaning is now obscured in many words from Latin (suggest, suspect, subject, etc.). The prefix is active in Modern English, sometimes meaning "subordinate" (as in subcontractor); "inferior"(17c., e.g. subhuman); "smaller" (18c.); "a part or division of" (c.1800, e.g. subcontinent).
以下是sub- 及其變體的含義：
1．紅…底下，在…下邊
subordinate, subservient, subsidiary
2．下位，副，一點(diǎn)，稍許
subtitle, subeditor, subacid
3．代替…
supplant, subaltern
4．精密地，細(xì)致地
subcommittee, subdivide, succinct
另外，前綴sub還有以下多種變形。
1．suc(在輔音字母c前)
succumb, succor
2．suf(在輔音字母f前)
suffrage, suffocate
3.sug(在輔音字母g前)
suggestion
4.sum(在輔音字母m前)
summons
5．sup(在輔音字母p前)
supplement, suppress
6.sur(在輔音字母r前)
surrogate, surreptitious
7．sus(在輔音字母c．p，t前)
susceptible, suspension, sustenance
此外，前綴sub有一些同義前綴，也有“在底下，在下邊”的意思，還有一些意為“在上邊”的反義前綴。
I．同義前綴
under
II．反義前綴
up
例句：
1.submissive [(sub( =under) +
adj. be～to yielding to the control or authority of another; meek 服從的，順從的；柔順的，溫順的 submit 服從，投降，屈服；提交 submission 服從，投降
舉例： Rather than being submissive or aggressive, it's healthier to be assertive.
比起順從或挑釁，堅(jiān)持己見要更有益于身心。
2.subordinate [(sub( =under) +
adj. be～to inferior to or placed below another in rank,power,importance,etc. 地位、階級(jí)等低的；下級(jí)的；從屬的
n. person in a subordinata position 下級(jí)，從屬者，部下
vt. place in a subordinate position 把…列入下級(jí)，使從屬
subordination 下級(jí)，從屬 subordinative 從屬的
舉例： If you speak to my subordinate, he can get the answer for you.
如果你跟我的下屬講，他會(huì)給你一個(gè)答復(fù)的。
3.subsequent [(sub( =under) +sequ（=follow）在下面（尾部）接著發(fā)生]
adj. be～to coming after; following in time, place, or order 后續(xù)的；以后的
subsequently 此后，其后，隨后 subsequence 后繼
舉例： Subsequent tests revealed that she was suffering from pleurisy.
接下來的檢查結(jié)果證明她患了胸膜炎。
4.suffrage [(suf<sub( =under) +frag( =break, loud applause)稱贊到底]
n. franchise, right of voting in political elections; vote, consent expressed by voting 授票權(quán)，選舉權(quán)；投票；贊成票
舉例： Suffrage is constitutionally guaranteed to all non-criminal adults.
憲法保障所有不違法的成年人都有選舉權(quán)。
5.supplement [sup<sub( =under) +
vt. sth+with+sth make up for a lack or deficiency 補(bǔ)充
n. something added 補(bǔ)充，增補(bǔ)；附錄，增刊
supplementary 補(bǔ)充的，追加的；補(bǔ)角的
舉例： Most breakfast cereals contain a host of vitamin and mineral supplements.
大部分的早餐谷類食品中都含有大量的維生素和礦物質(zhì)添加劑。
詞根：
1.miss(=send)
commission 委任：手續(xù)費(fèi)；委員會(huì) *com( =together)
intermission 中止，間斷；休息時(shí)間 *inter( =between)
surmise 推測 *sur<super( =over)
2.ordin(=order)
ordination 種職授任儀式；排列
coordinate 同等的，同級(jí)別的；(pl.)（數(shù)學(xué)）坐標(biāo) *co<com(=together)
ordain （神、命運(yùn)等）注定
3.sequ(=follow)
sequent 連續(xù)的；作為結(jié)果產(chǎn)生的
inconsequential 不合邏輯的，不合理的 *in (=not), con<com( =together) obsequial 葬禮儀式的 *ob( =to, intensive)
4.frag(=break)
fragile 易碎的 fragmentation 分裂
infringe 違反，侵害 *in( =in, against)
5.ple(=fill)
complement 補(bǔ)充物；補(bǔ)語 *com( =with)
plenipotent 有全權(quán)的 *pot(=powerful)
repletion 充滿 *re(=again)
6.substantial [sub( =under) +st( =stand)站在下面]
adj. virtual; having physical existence; essential; solidly or strongly built or made;large; ample; considerable; well-to-do 實(shí)質(zhì)的，本質(zhì)上的；健壯的，結(jié)實(shí)的；大量的，豐富的，豐足的；富裕的
substantiate 證實(shí)；使實(shí)體化 substance 物質(zhì)：本質(zhì)；要旨；堅(jiān)固；財(cái)產(chǎn)
substantive 獨(dú)立的；實(shí)際的
舉例： He promised me a substantial salary raise around the first of the yerar.
他答應(yīng)我，年初左右會(huì)給我大幅度提升薪水。
7.sustain [sus<sub( =under) +
vt. keep from falling or sinking; keep up; maintain; suffer, undergo; support;
uphold-admit 支撐；維持；遭受、蒙受損失等；經(jīng)歷，承受：供養(yǎng)，維持（生命等）；確認(rèn)；認(rèn)可 sustenance 生計(jì)；食品，營養(yǎng)品；維持
舉例： During the lean years, egg sales alone sustained our farm.
趕上災(zāi)年，我們只能靠賣雞蛋來維持農(nóng)場的生計(jì)。
8.subjugate [sub (=under) +jug (=bind, join)在下面捆]
vt. bring under control or subjection; conquer 使服從；使從屬；征服
subjugation 從屬；征服
舉例： Rapists subjugate women not only physically but also emotionally.
強(qiáng)奸犯不僅從身體上而且從情緒上迫使女性屈從。
9.succumb [suc<sub( =under) +cumb( =lean．lie)向下屈身]
vt. to+sth give way to; yield to temptation, flattery, etc.; die 屈服，屈從于；死
舉例： He succumbed to malaria after several long nights of chills and fevers.
經(jīng)受了幾夜的風(fēng)寒和高燒，他最終死于瘧疾。
10.supplant [sup<sub( =under,in place of) +plant( =plant)取代某物栽種]
vt. take the place of; take the place of someone, especially after getting him out of office 取代；把…排擠掉 supplanter 取而代之的人
舉例： Lasers supplanted the use of scalpels for eye surgery decades ago.
激光替代了幾十年前眼科手術(shù)中使用的解剖刀。
詞根：
1.st(=stand)
unstable 不穩(wěn)定的 *un (=not)
estate 階級(jí)；地產(chǎn)；財(cái)產(chǎn) *e<ex( =out)
obstacle 障礙（物） *ob( =in the way)
2.tain(=hold)
contain 包含 *con<com( =together)
maintain 維持 *main<man( =hand)
obtain 礙到，獲得 *ob( =to, intensive)
3.
conjugation 結(jié)合，連接 *con<com( =together)
conjugal 夫婦間的；結(jié)婚的 *con<com( =together)
conjugal 婚姻；夫妻生活 *con<com (=together)
4.cumb(=lean,lie)
encumbor 妨礙 *en (=in)
incumbency 負(fù)擔(dān)，義務(wù)；在職 *in( =on)
incubus 噩夢；心理負(fù)擔(dān) *in (=in)
5.plant(=plant)
implant 灌輸 *im<in (=in)
transplant 移植 *trans( =over, across)
transplantation 移植 *trans(=over, across)