intervene

verb

1. 1

   occur between other event or between certain points of time

   the war intervened between the birth of her two children

2. 2

   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?

3. 3

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

   This interludes intervenes between the two movements

   Eight days intervened