sound off

Verb

sound off (third-person singular simple present sounds off, present participle sounding off, simple past and past participle sounded off)

1. (informal, transitive) To hold forth about something in an opinionated manner.
   • I'm sick of his sounding off about how he thinks this country should be run!
   • I would give anything to be at the hearing so that I could really sound off about this attempt to cram another liquor license into Jamaica Plain. I say kill it today.1986 February 1, Kim Westheimer, quoting Albert O'Neil, “Board Hears Testimony on Saints' Liquor License”, in Gay Community News, volume 13, number 28, page 10
2. Command instructing a person to speak up or acknowledge something.
   • Hartman: […] Do you maggots understand that?
     Recruits: Sir, yes, sir!
     Hartman: Bullshit! I can't hear you. Sound off like you got a pair.
     Recruits: SIR, YES, SIR!1987, Stanley Kubrick, director, Full Metal Jacket
3. Command instructing a person to confirm that they are present or that some other objective has been met.
   • Cyclops: […] X-men… Sound off …
     Man 1: Iceman, sounding off!Man 2: Fireman, sounding off!
     Man 3: Clothing-Man, sounding off!
     Man 4: Ability-to-Hop-Man, here!2004, Astonishing X-Men, number 5, Marvel Comics
   • Tagon: Sound off! Brad, do you have the Ambassador?
     Brad: Check!
     Tagon: Schlock, do you have our money?
     Schlock: Check!
     Tagon: Are we still being pursued?
     Creeth Soldiers: Check!2000 August 19, Schlock Mercenary