Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “sit in”

sit in

verb phrasal verb with sit  /sɪt/ us  

(ACT FOR SOMEONE)

to fulfill a responsibility for another person: The vice president will sit in for the president at today’s meeting. A musician who sits in plays music with someone the musician does not usually play with: Jeanne needed a drummer and asked if I could sit in.
(Definition of sit in phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of sit in?
Add Cambridge dictionaries to your browser to your website

Definitions of “sit in” in other dictionaries

Word of the Day

scrumpy

an alcoholic drink made from apples

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More