go off verb 19go-off noun 1forms 5 verb19 •To depart; to leave.Having sated her appetite, she went off in search of a place to sleep.I don't know where he's going—he went off without a word. •To explode.The bomb went off right after the president left his office. •To fire, especially accidentally.The gun went off during their struggle. •To begin clanging or making noise.The alarm will go off at six a.m.Just after he spotted the first plane on the horizon, sirens started to go off around the city. •(UK, Australia) To putrefy or become inedible, or to become unusable in any way.Bugger—the milk's gone off already! •To stop operating; to switch off.We were watching TV when suddenly the power went off. •Of dairy cattle, to stop producing milk.‘I suppose no other mahn in th’ district feeds as well as I do, and yet they’re goin’ off - goin’ off to th’ very divil.’ — 1911 •To pass off; to take place; to be accomplished; to happen.The party went off very well. •(figurative) To explode metaphorically; to become very angry or overexcited.It all went off when the opposing teams' fans met at the railway station.When the boss came to know about the scheme, he went off, shouting and throwing everything away. •(slang) To rant; to talk at length negatively; to insult or criticize.They went off about all the problems around here. •To like gradually less.Ever since falling off her bike, she's gone off cycling to work.We needed a vet visit because some of the cattle had gone off their feed. •To follow or extrapolate from something; to assume as true or to judge by.Going off the interview alone, she seemed like the perfect employee. •To perform extremely well; to be impressive or attractive; often used to express encouragement.Go off, queen! •(slang) To fall unconscious; to go to sleep; to die.One day I'll go off, but until then, I'm in charge around here. •(slang) To ejaculate; to orgasm. •(UK) To cure; to set.I've got to get the panels aligned quickly now because the epoxy resin will go off within 20 minutes or so. •(slang) To fight or attack. •(slang, no longer used) To get married.We can only hope she'll go off soon. •(slang, no longer used) To be spent, disbursed or used up.All his money goes off as soon as he earns it. go-off noun1 •start; beginning; commencementCorley at the first go-off was inclined to suspect it was something to do with Stephen being fired out of his digs for bringing in a bloody tart off the street. — 1922 formswent off · gone off · going off · goes off · go-offs