An unkind trick. / (in the plural) Unethical or illegal tactics used against an opponent.

To fire a gun. / (idiomatic) To commit to a course of action. / (soccer, idiomatic, intransitive) To shoot, kick the ball in hope of scoring a goal. / (tennis, informal) To hit a very powerful shot.

(mathematics) Any integer that is the sum of n natural numbers from 1 to n.

plural of tribute band

(Canada and US, ice hockey) The triple achievement of a goal, an assist for a goal, and participation in a fight, within a single game.

(chiefly US, idiomatic, of a prostitute) To perform a sexual service for a customer.

plural of trick shot

A fractal consisting of three copies of itself, shrunk to half size, arranged in a triangular shape without rotating.

(geometry) A figure consisting of three circular arcs, each centered on the intersection of the other two.

plural of tricuspid valve