(chiefly imperative) To have fun or live fully; may imply letting things that are going well proceed; if it ain't broke, don't fix it.

(mathematics) A branch of applied mathematics and engineering involving the quantification of information sent over a communication channel, disregarding the meaning of the sent messages, exemplified by the noisy-channel coding theorem.

(US) The criminal act of stealing or attempting to steal a motor vehicle.

(idiomatic) A gesture of acknowledgement; often, an expression of gratitude; originally by doffing one's hat.

To be in control of the steering wheel of a vehicle or a vessel. / (idiomatic, by extension) To assume control of a situation.

(Canada and US, ice hockey, idiomatic) To fight. / (Canada and US, idiomatic, by extension) To remove a prior impediment to action; to prepare for or engage in a dispute.

(idiomatic) Alternative form of everything but the kitchen sink

(idiomatic) The roles of people in a situation have been reversed, such that the advantage has shifted to a party which was previously disadvantaged.

(idiomatic, transitive) To state strongly, clearly, and accurately. / (idiomatic, transitive) To risk.

(statistics and mathematics, singular only) The theorem that states that if the sum of independent identically distributed random variables has a finite variance, then it will be approximately normally distributed.