a liquid or semiliquid substance used as a relish, dressing, or accompaniment to food

tomato sauce

NAmer stewed fruit eaten as a dessert

something that adds zest or piquancy

chiefly Brit, informal cheek or impudence

(the sauce) chiefly NAmer, informal alcoholic drink

to dress or prepare (food) with a sauce

to make (something) more interesting

informal to be impudent to (somebody)