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 talk casually, especially in order to gain an advantage or make a social connection.
A casual conversation, especially one held in order to gain an advantage or make a social connection.