Part of speech: Verb
use to one's advantage
Example: He availed himself of the available resources
Categories: Use, Utilize, Utilise, Apply, Employ
Part of speech: Verb
be of use to, be useful to
Example: It will avail them to dispose of their booty
Categories: Help, Assist, Aid
Part of speech: Verb
take or use
Example: She helped herself to some of the office supplies
Categories: Exploit, Work
The word "avail" comes from Old French a, which comes from Middle English availen.
The Norman Conquest of 1066 brought thousands of French words into English overnight.