intervene
US /ˌɪn.t̬ɚˈviːn/
UK /ˌɪn.t̬ɚˈviːn/
1.
come between so as to prevent or alter a result or course of events
:
•
The police had to intervene to stop the fight.
•
He decided to intervene in the dispute between his friends.
2.
(of an event or circumstance) occur between two things, especially so as to prevent or modify a result
:
•
A long period of peace intervened before the next war.
•
Several years intervened between his first and second novels.