Real Dictionary

engage
verb: If you engage in an activity, you do it or are actively involved with it.

engage in American English
committed to supporting some aim, cause, etc.
to give or assign as security for a debt, etc.
adjective: choosing to involve oneself in or commit oneself to something
intransitive verb: to occupy oneself; become involved
transitive verb: to occupy the attention or efforts of (a person or persons)

engage in Automotive Engineering
verb: If you engage a clutch or a gear, you put the mechanism into operation.

engage in British English
to secure the services of; employ
adjective: (of a male writer or artist) morally or politically committed to some ideology