(intervenes, intervening, intervened)
1.
If you intervene in a situation, you become involved in it and try to change it.
The situation calmed down when police intervened...
The Government is doing nothing to intervene in the crisis.
VERB: V, V in n
2.
If you intervene, you interrupt a conversation in order to add something to it.
Hattie intervened and told me to stop it...
'I've told you he's not here,' Irena intervened.
VERB: V, V with quote
3.
If an event intervenes, it happens suddenly in a way that stops, delays, or prevents something from happening.
The South African mailboat arrived on Friday mornings unless bad weather intervened...
VERB: V