The largest stringed instrument of the violin family. / The deepest of all male voices.

A film stand-in for an actor, in scenes not involving the face, especially during scenes of nudity, or of dangerous activity.

(bridge) A double, usually indicating strength and a desire to play the hand; partner is expected to "take out" by making a bid.

An abrupt movement, used, for example, as a comical reaction to a surprising sight, in which someone casually sees something, briefly stops looking at it, realizes what it is, and snaps attention back to it with an expression of surprise or disbelief.

(astronomy) Two stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields; a binary star.

Pneumonia affecting both lungs.

A series of two events that causes adverse effects; a twofold blow or setback. / (by extension) A series of two events that causes positive effects; a twofold boon.

(idiomatic) To retrace one's steps; to go back where one has already gone.

(baseball, softball) A defensive play in which two outs are recorded. / (US, colloquial) Achieving two results from one action.

A situation where two things are changed at once / (baseball) A replacement of two players simultaneously, typically so that a fielder can hit in the pitcher's spot in the batting order.