Examples of using "вмешаться" in a sentence and their english translations:
Should we intervene?
We must intervene.
I could intervene.
We must intervene.
Tom tried to intervene.
I could intervene.
I won't let them interfere.
I won't let him interfere.
I won't let her interfere.
and they failed to act in time to intervene,
The kids fought with each other, so the parents had to intervene.
The kids fought with each other, so the parents had to intervene.