to correct a previous error or misunderstanding, especially one in print

(set phrase) The manner of one's lower facial expression, especially as suggesting firm resolve, or intensity of thought or feeling.

(obsolete) Alternative form of set by the ears

To create a disturbance.

(set theory) The axiom that the power set of any set exists and is a valid set, which appears in the standard axiomatisation of set theory, ZFC.

(set theory) An early and influential axiomatisation of set theory.

Synonym of put pen to paper

(chiefly UK) To talk about improving the world.

(idiomatic) Something comes to an end.

Synonym of get the ball rolling.