(military, idiomatic) To fire a weapon with the intent of causing damage or harm to an opponent (as opposed to a warning shot or a practice shot).

(law) The concept that no legal action can be instituted twice for the same cause.

An old game played with four dice, a double being referred to as "in" and two doubles as "in-and-in".

(transitive, slang, vulgar, UK) To punish or take retribution on someone.

Something is not affected in the same way twice.

(idiomatic) In the possession of, or protected by, someone who can be trusted.

(transitive, card games) To deal cards to someone entering a game; to enter someone into a game by dealing cards to that person. / (transitive) To trade (buy and sell) a named commodity.

Alternative form of in the meantime

(optics, uncountable) A phenomenon where light, instead of passing into a medium of a lower refractive index and refracting away from the normal, is completely reflected by the boundary between the two media because it approaches at an angle greater than or equal to the critical angle.

(optics) total internal reflection