interpose

verb5

1. •
   To insert something (or oneself) between other things.

   • What watchful cares do interpose themselves Betwixt your eyes and night? — 1599
2. •
   To be inserted between parts or things; to come between.

   • Suppose, unlook’d for in a scene so rude, Long hid by interposing hill or wood, Some mansion neat and elegantly dress’d, By some kind hospitable heart possess’d Offer him warmth, security and rest — 1781
3. •
   To interrupt a conversation by introducing a different subject or making a comment.

   • “A beautiful country!” “I suppose it is. Everybody says so.” “Your cousin Feenix raves about it, Edith,” interposed her mother from her couch. — 1846
4. •
   To intervene in a dispute, or in a conversation.

   • The doctor now interposed, and prevented the effects of a wrath which was kindling between Jones and Thwackum […] — 1749
5. •
   To offer (one's help or services).