avail

(transitive, often reflexive) To turn to the advantage of.

(transitive) To be of service to.

(transitive) To promote; to assist.

(intransitive) To be of use or advantage; to answer or serve the purpose; to have strength, force, or efficacy sufficient to accomplish the object.

(India, Africa, elsewhere proscribed) To provide; to make available; to use or take advantage of (an opportunity or available resource).