The phrasal verb 'step in' is predominantly used in informal speech, though it sees some limited use in more formal contexts as well. It generally implies entering a situation to provide assistance, intervene, or assume control, often in response to an issue or problem requiring immediate attention. Common usage contexts include scenarios where someone takes over a task due to another's unavailability or intervenes in a dispute to mediate or resolve it. The versatility of 'step in' means it can apply to both everyday personal situations—such as "when John was too ill, his colleague stepped in to finish the report"—and organizational or structural issues, like "the government had to step in to stabilize the economy." In formal writing or speech, a synonymous phrase like 'intervene' or 'mediate' might be preferred, but 'step in' remains a dynamic and relatable choice in various narratives.
B1
PreIntermediate
1. To become involved in a situation, often to help solve a problem or diffuse tension.
The manager had to step in to resolve the conflict between the two employees.
When the discussion became heated, she stepped in to calm everyone down.
2. To take on a role or responsibility, usually temporarily, to fill a vacancy or fulfill a need.
The assistant principal will step in for the headmaster while he is on leave.
I need someone to step in for me during the meeting as I have a dentist appointment.