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

See also:

go out for
go out for (something)
shine
shined
snatched
bring (something) with
bring with
no siree Bob
nummers
sweats

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