Resign (4)
'resign' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for stand down that I've seen before include "Leave the witness box" , "Withdraw voluntarily, from job or competition" , "Withdraw as from competition, be seated" , "Withdraw from post or competition" , "not to be a candidate" .)
'resign' is the definition.
(I know that resign is a kind of resign)
This is all the clue.
(Other definitions for step down that I've seen before include "Leave office" , "Get off one's soap-box" , "Resign from office" , "Give up office" , "decrease in output" .)
'resign' is the definition.
(to quit something is to resign from it)
This is the entire clue.
(Other definitions for quit that I've seen before include "Stop (smoking, perhaps)" , "Stop; abandon" , "Leave, desert" , "Give up (smoking?)" , "Left" .)