intervene

(verb) get involved, so as to alter or hinder an action, or through force or threat of force. Synonyms: step in, interfere, interpose. Example: "Why did the u.s. not intervene earlier in ww ii?."

(verb) be placed or located between other things or extend between spaces and events. Examples: "This interludes intervenes between the two movements." "Eight days intervened."

(verb) occur between other event or between certain points of time. Example: "The war intervened between the birth of her two children."