(chiefly UK) To be introverted; to stay away from others.

(idiomatic) To remain vigilant for someone or something. / (idiomatic) To remain vigilant for a possibly dangerous situation.

(intransitive) To avoid or eschew. / (transitive) To deny (someone or something) access to, to maintain distance between.

To keep one's own business private; to be careful, circumspect, or discreet in what one says concerning one's own deeds, situation, or thoughts.

(idiomatic, Britain, colloquial) To stay calm; to be patient; to calm down.

(idiomatic) To perform satisfactory physical labor or to provide other worthy services in return for remuneration, lodging, or other benefits; to support oneself financially.

(idiomatic) To remain composed, calm, and even-tempered, especially in a provocative situation.

(idiomatic) To keep one's cool; to stay calm.

(idiomatic) To keep someone uninformed and waiting for a response.

(chiefly UK) To keep in practice.