monkey business

bad business

Synonym of bad news (“irritating, troublesome or harmful thing, situation or person”).

brass monkey

Very cold.

business as usual

The normal course of an activity, particularly in circumstances that are out of the ordinary.

business end

The part of an object (chiefly a tool or weapon) that is physically used for its operation, rather than some other part such as the part by which it is held.

business girl

A female prostitute.

cheeky monkey

An impudent person, usually a child.

do one's business

Especially of a house pet: to defecate or urinate.

get down to business

To commit oneself to a task or activity that is employment-related or that requires serious effort or concentration.