The phrasal verb "call in" is primarily used in informal contexts but can occasionally appear in more formal settings, depending on the context. It has several meanings, including requesting someone's presence or services, contacting someone via phone, or announcing participation in media formats like radio or television. Commonly used in everyday situations, people might 'call in' an expert for advice, like a plumber to fix a leak, or 'call in' sick to notify their workplace of an illness. In media, listeners or viewers might 'call in' to participate in discussions or contests. Due to its versatility in everyday communication, "call in" sees use in a variety of settings, despite its more casual tone. Its meaning is generally understood even when used in slightly more formal contexts, as long as it pertains to events where such informal contact might naturally occur.
B1
Intermediate
1. To request someone to come somewhere, especially to give assistance or advice.
They decided to call in an expert to solve the problem.
We had to call in the fire department because of the smoke.
She was called in for an urgent meeting.
2. To communicate with a central office or place of work, often by telephone.
The truck drivers are required to call in every couple of hours with updates.
Please call in when you arrive at your destination.