step in
[verb]
Synonyms: intervene, become involved, take action

[TahlilGaran] English Synonym Dictionary ▲

step in phrasal verb (see also step)
to become involved in an activity, discussion, or disagreement, sometimes in order to stop trouble Synonym : intervene:
The military may step in if the crisis continues.
Parents have stepped in to provide homework help in the afternoon program.

[TahlilGaran] Dictionary of Contemporary English ▲

step in
to become involved.
An outside buyer stepped in to save the company.

Related vocabulary: step up to the plate

[TahlilGaran] English Idioms Dictionary ▲

step in
v.
1. To go inside for a quick visit.
It was a cold night, and when the policeman passed, we invited him to step in for a cup of coffee.
2. To begin to take part in a continuing action or discussion, especially without being asked.
When the dogs began to fight, John stepped in to stop it before they were hurt.
When Bill had done as much as he was able to on his model plane, his father stepped in to help him.

[TahlilGaran] English Idioms Dictionary ▲