(of an apartment etc) Reached by stairs rather than an elevator. / (of a block of apartments) Containing such flats. / (of a service) For which no appointment is necessary.

(US) An apartment or block with stairs rather than an elevator. / (aviation) An informal visit to a control tower by a pilot, typically used as part of pilot training.

(idiomatic, litotes, understatement) Misbehaving, being mischievous.

(idiomatic) Doing something mischievous or scheming.

(intransitive, said of the weather) To become brighter / (transitive) To make cheerful.

(transitive) To make an area or a thing clean; to pick up a mess; to tidy.

Alternative form of cleanup

(intransitive) To mature and become an adult. / (intransitive) To start to develop; to flourish. / (intransitive, idiomatic) To stop acting as or like a child (often used as an imperative interjection).

(transitive) To create a model or demonstration; to create a preliminary version or sample.

(informal, transitive) To ruin unintentionally. / (informal, Australia, intransitive) To clown around; to have fun, often at the expense of others.