To busy oneself.

transitive. To be concerned or involved with; to meddle with. rare.

To have to do with (a thing) in any way; to busy or occupy oneself, to concern oneself with.

transitive. In questions introduced by an objective what: to have as one's business or purpose, to do (as what make you here?). Now archaic and reg…

transitive. To devote one's energy to, to handle vigorously; to practise (one's business, or a pursuit or activity); = ply, v.2 2b. In later use…

The state of having one's time or attention occupied; what a person is engaged in; employment, business; work, toil.

To live under specified circumstances or engaged in some specified occupation. (With at, about.) Obsolete.

transitive. To occupy oneself with. Obsolete.

to consist in. To be, exist, or be engaged in. Obsolete.

To exercise oneself upon (in thought or action).

intransitive. With with: to contend with, to fight. Obsolete.

colloquial. to be in the business of: to be engaged or involved in, to be concerned with. Frequently in negative contexts.