To interrupt a conversation by introducing a different subject or making a comment.
To intervene in a dispute, or in a conversation.
To insert something (or oneself) between other things.
To be inserted between parts or things; to come between.
To offer (one's help or services).
To stop oneself from some action or interference; to abstain.
To abstain from (food or drink).
The chorus or burden of a song repeated at the end of each verse or stanza.
A much repeated comment, complaint, or saying.