Interpose

v. place between, insert; place oneself between, mediate; inject a remark in the middle of a conversation, interject

Verb
1. be or come between; "An interposing thicket blocked their way"
2. introduce; "God interposed death"
(hypernym) introduce
3. to insert between other elements; "She interjected clever remarks"
(synonym) interject, come in, put in, throw in, inject
(hypernym) interrupt, disrupt, break up, cut off
(derivation) interposition
4. get involved, so as to alter or hinder an action, or through force or threat of force; "Why did the U.S. not intervene earlier in WW II?"
(synonym) intervene, step in, interfere
(hypernym) interact
(hyponym) poke into, intrude into, meddle with, horn in

v. interpose, insert, place

v. interpose, interject, insert

(v. t.)
To thrust; to intrude; to between, either for aid or for troubling.
  

(v. t.)
To place between; as, to interpose a screen between the eye and the light.
  

(v. t.)
To introduce or inject between the parts of a conversation or argument.
  

(v. i.)
To utter a sentiment by way of interruption.
  

(v. i.)
To step in between parties at variance; to mediate; as, the prince interposed and made peace.
  

(v. i.)
To be or come between.
  

(n.)
Interposition.