для поиска по нескольким словам разделяйте слова запятыми, например heart,one

Фразеологизмы со словами sit in

sit in
sit in on
To be a member; participate. To be a member of; participate in.
We're having a conference and we'd like you to sit in.
We want you to sit in on the meeting.
To attend but not participate. Often used with on.
Our teacher was invited to sit in on the conference.
Compare:look on