sit in on (something)
sit in on (something)
To attend something as an informal spectator, visitor, or participant. The boss wants to sit in on the production meeting to make sure everything is going smoothly. The professor invited me to sit in on some of his lectures, even though I wasn't enrolled in the college.
See also: on, sit
Farlex Dictionary of Idioms.
- go out for
- go out for (something)
- card
- carded
- carding
- yes, sirree
- bring (something) with
- bring with
- party to
- how-d'ye-do