keep company

bad company

The wrong crowd.

cobbler, keep to your last

One should not criticise matters outside one's field of expertise; one should mind one's business.

company town

A town, city, or other municipality in which a single large business has a controlling influence over the economy and, sometimes, over the societal structure and the local government.

earn one's keep

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

keep a civil tongue in one's head

To maintain a polite manner of speaking.

keep a close watch

to pay careful attention to a situation or a thing, so that you can deal with any changes or problems.

keep a cool head

To keep one's cool; to stay calm.

keep a lid on

To keep something secret.