à quatre (Fr.), of or between four: four together.
à quatre épingles (Fr.), lit. 'with four pins,' with the most careful neatness.
à quatre mains (Fr.), for four hands.
a quatr' occhi (It.), lit. 'to four eyes,' face to face, tête-à-tête.
aqua vitæ (L.), water of life.
aquila non capit muscas (L.), an eagle does not catch flies.
à quoi bon? (Fr.), what's the good of it?
à ravir (Fr.), in ravishing style.
arbiter elegantiarum (L.), a judge in matters of taste.
arbitrium (L.), power of decision.