(obsolete, idiomatic) To take offence.

(engineering) A secondary nut, screwing down upon the primary nut to secure it.

A valve in a pipeline which allows the liquid or gas to flow in one direction only.

(chiefly US) In a dormitory, as in the military or at a childrens' campground or in a boarding school, an inspection after bedtime by authorities to ensure that everyone is present and in his or her bed.

Alternative form of bed check

(baseball) A checked (halted, partial) swing of the bat.

plural of check swing

A ticket of admission to a place of entertainment, or of readmission for one who goes away expecting to return.

A hook on the saddle of a harness, over which a checkrein is looped.

(idiomatic) To permit someone to continue onward, e.g. through a security checkpoint, after verifying their identity, tickets, etc.