slouch

1. V-I If someone slouches, they sit or stand with their shoulders and head bent so they look lazy and unattractive. 無(wú)精打採(cǎi)地坐; 無(wú)精打採(cǎi)地站

Try not to slouch when you are sitting down. 你坐下時(shí)盡量不要無(wú)精打採(cǎi)。