verb / noun
avail
uh-VAYL/ʌvˈeɪl/
Practical help or usefulness.
The woman avails herself of a reacher to retrieve the dropped keys.

Etymology
Apparently formed from “to” and “be worth,” avail connects usefulness with having value or efficacy: something that avails people has practical worth in helping them.
In context
I am still no nearer to my desire, nor will it avail me in getting back my bowmen. It may cost a score of men, and what profit shall I have from it?
More examples
- We searched the house for the missing key to no avail.
- His careful preparations availed him little when the road closed.
- They are availing themselves of every opportunity to practice.
Forms
avail · avails · availed · availing