A form of light-hearted extortion by which children get candy on Halloween.

(informal) To work; to be successful; to solve a problem; to be sufficient or adequate to fulfill a purpose.

plural of trick play

(American football) A play in American football that uses deception and unorthodox strategies to fool the opposing team. / (uncountable) Synonym of trick mode

A plot device in traditional literature and theatre where a character begins sexual activity with someone else, then steals away after the lights are off, allowing another character to continue instead.

Third-person singular simple present indicative form of trick-or-treat

simple past tense and past participle of trick-or-treat

(set theory) A method for giving a definition of equivalence classes for equivalence relations on a proper class, relying on the axiom of regularity but not on the axiom of choice.

Any magic trick involving playing cards.

(mathematics) A method for proving Gödel's incompleteness theorems without the assumption that the theory being considered is ω-consistent. While Gödel's original proof uses a sentence that states (informally) "This sentence is not provable", Rosser's trick uses a formula that says "If this sentence is provable, there is a shorter proof of its negation".