Interpose (verb)

1. To come or be between two things or people, especially in order to prevent a problem or to improve a situation.
2. To insert something into a situation or conversation.
3. To place something between two other things.

Origin:

Late 16th century (in the sense "place between"): from latin interponere, from inter- "between" + ponere "to place".

Examples:

1. The government decided to interpose themselves in the dispute between the two companies.
2. She interposed a comment during the discussion.
3. He interposed a barrier between the two hostile parties.
4. The teacher interposed a word of caution before the class began the experiment.
5. He interposed a remark about the weather before continuing the conversation.