intervene

Definitions of intervene in various dictionaries:

verb - get involved, so as to alter or hinder an action, or through force or threat of force

verb - be placed or located between other things or extend between spaces and events

verb - occur between other event or between certain points of time

To come, appear, or lie between two things: You can’t see the lake from there because the house intervenes.

To come or occur between two periods or points of time: A year intervened between the two dynasties.

To occur as an extraneous or unplanned circumstance: He would have his degree by now if his laziness hadn’t intervened.

To come in or between so as to hinder or alter an action: intervened to prevent a fight.

To interfere, usually through force or threat of force, in the affairs of another nation.

To enter into a suit as a third party for one’s own interests.