intervene
verbUK /ˌɪntəˈviːn/
US /ˌɪntərˈviːn/
To step in and help stop a problem or fight.
The teacher had to intervene when the two boys started arguing.
RELATED WORDS
OTHER MEANINGS
2. To happen between two events and delay or change them.
A sudden storm intervened and canceled our picnic.
3. To become involved in a situation in order to improve or worsen it.
The government intervened to lower the price of medicine.
4. To occur or appear as an interrupting factor.
Nothing intervened to stop the meeting from starting on time.