sound off about something

sound off (about something)

1. To express an opinion, especially a complaint, loudly and intensely. Please don't bring up politics—I don't want my brother sounding off again. She never wastes an opportunity to sound off about the city's sub-par public transportation.
2. To interrupt or speak at an inappropriate time. We can't get through a single meeting without Janet sounding off about whatever we're talking about. If you sound off like that again, I'll have to ask you to leave the class.
See also: off, sound
Farlex Dictionary of Idioms.

sound off (about something)

1. in. to complain about something; to gripe about something. You are always sounding off about something that gripes your soul.
2. in. to speak out of turn about something. Who asked you to sound off about this?
3. in. to announce something. Why did you have to go and sound off about the surprise party?
See also: off, something, sound
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • bug off
  • Bug off!
  • don't get me wrong
  • don't beat a dead horse
  • all in (one's) head
  • (someone's) secret is safe with (one)
  • come it
  • come it (with one)
References in periodicals archive
Shame they couldn't force her to clean her mess with her tongue instead of using it to sound off about something of which she should be ashamed.
And every week someone has the chance to sound off about something that annoys them.