To enlist oneself (in something) or become a member (of something)
To enter (a name, etc.) in a register, roll or list
To enlist (someone) or make (someone) a member of
The chorus or burden of a song repeated at the end of each verse or stanza.
A much repeated comment, complaint, or saying.
To stop oneself from some action or interference; to abstain.
To abstain from (food or drink).