井下

underground / in the pit (mining)

a well / CL:口[kou3] / neat / orderly

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action

to throw stones at sb who has fallen down a well (idiom) / to hit a person when he's down

to throw stones at sb who has fallen down a well (idiom) / to hit a person when he's down