interpose

interpose (http://definr.com/interpose)

     v 1: be or come between; "An interposing thicket blocked their
          way"
     2: introduce; "God interposed death"
     3: to insert between other elements: "She interjected clever
        remarks." [syn: interject, come in, put in, {throw
        in}, inject]
     4: get involved, usually so as to hinder or halt an action;
        "Why did the U.S. not intervene earlier in WW II?" [syn: intervene,
         step in, interfere]