(US, idiomatic, informal) Synonym of ace up one's sleeve

(dated) a military aviator who had shot down many enemy aircraft

(idiomatic) very near; on the point of

(poker slang) A poker hand containing only a pair of aces / (bridge slang) A bridge hand with opening points based primarily on aces, so that there are not enough winners.

(tennis) A point made by the opponent returning the ball in such a way that the server does not make contact

plural of return ace

(medicine) Any of a class of blood pressure-lowering drugs, including captopril and enalapril, that cause the arteries to widen by preventing the synthesis on angiotensin

plural of ace in the hole

plural of ACE inhibitor

plural of ace of spades