interposer

transitive verb interposed, interposing

1. to place or put between; insert
2. to introduce by way of intervention; put forward as interference
3. to introduce (a remark, opinion, etc.) into a conversation, debate, etc.; put in as an interruption

Origin: Fr interposer, altered (infl. by poser: see pose) < L interpositus, pp. of interponere, to set between < inter-, between + ponere, to put, place: see position

intransitive verb

1. to be or come between
2. to intervene or mediate
3. to interrupt