n A liquid (often thickened) condiment or accompaniment to food.
n (UK, Australia, New Zealand, India) Tomato sauce (similar to US tomato ketchup), as in:
n (slang, usually “the”) Alcohol, booze.
n (bodybuilding) Anabolic steroids.
n (art) A soft crayon for use in stump drawing or in shading with the stump.
n (dated) Cheek; impertinence; backtalk; sass.
n (US, obsolete slang, 1800s) Vegetables.
n (obsolete, UK, US, dialect) Any garden vegetables eaten with meat.
v To add sauce to; to season.
v To cause to relish anything, as if with a sauce; to tickle or gratify, as the palate; to please; to stimulate.
v To make poignant; to give zest, flavour or interest to; to set off; to vary and render attractive.
v (colloquial) To treat with bitter, pert, or tart language; to be impudent or saucy to.
v (slang) To send or hand over.
n (Internet slang) Alternative form of source, often used when requesting the source of an image or other posted material. [The person, place, or thing from which something (information, goods, etc.) comes or is acquired.]