Intervene
[v] get involved, usually so as to hinder or halt an action; "Why did the U.S. not intervene earlier in WW II?"
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act between, arbitrate, arrest, bargain, barge in, bottle up, break, break in, break in upon, burst in, butt in, call a break, call time, charge in, check, come between, countercheck, crash, crash in, crash the gates, creep in, crowd in, curb, cut in, dam