reflexive. To address or apply oneself. (So Old French s'atillier à.)

transitive. To set to an act or action, or to do something. Also reflexive.

transitive (reflexive). To direct one's skill or energies to some task, goal, or purpose; to devote oneself.

transitive (reflexive). To address oneself to a place, or to do something.

reflexive. To apply oneself. Obsolete.

transferred and figurative; esp. To invest (money) in a commercial undertaking; to involve (a person) in an enterprise. †Also reflexive = sense 3b 4.

transitive (reflexive). To make oneself knowledgeable about something, esp. through direct experience; to acquaint oneself with something; (also) to…