step in
Get involved to help or fix a problem, or take over from someone else.
Meanings
To intervene in a situation to help, solve a problem, or prevent something bad from happening.
"When the argument got out of hand, the manager stepped in and told everyone to calm down."
To take over someone else's role or responsibilities, especially at short notice.
"When the lead actor fell ill, his understudy stepped in and gave a brilliant performance."
To physically enter a space by lifting the foot and placing it inside.
"She stepped in the elevator just before the doors closed."
Very common in both everyday and formal contexts. 'Step in to do something' and 'step in for someone' are the standard patterns. Also used literally to mean entering a space.
Commonly used with
Forms
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Synonyms
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