sit on

Verb

sit on (third-person singular simple present sits on, present participle sitting on, simple past and past participle sat on)

1. (idiomatic, transitive) To block, suppress, restrain (something).
   • The chairman sat on the report until the end of the legislative session.
2. (idiomatic, informal, transitive) To restrain (a person).
   • He started to act up, but she sat on him.
3. (idiomatic, transitive) To take no action on (something); to hold (something) in reserve without actually using.
   • I sent the boss my proposal three weeks ago and he's just been sitting on it.
   • I began to call the INS regularly to check up on the status of my application. I got the proverbial "run-around," and this effort only confirmed my suspicion that the INS was sitting on my application.1986, Gilberto Gerald, “With My Head Held Up High”, in Joseph Beam, editor, In The Life: A Black Gay Anthology
4. (transitive) To be a member of (something).
   • He sits on the appropriations committee.
5. (transitive) To hold an official inquiry regarding (something); to deliberate about (something).
6. (euphemistic, transitive) To insert (something) into one's vagina or anus from below.
   • Let me sit on it.
7. (transitive) Used other than figuratively or idiomatically: see sit, on.
   • The cat sat on the mat.