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Related to go off: go off on someone
1. To detonate. Run! The bomb in the building could go off at any moment!
2. To begin to make noise. The whole building had to evacuate because the smoke alarm went off.
3. To depart. If you want mom to get something for you, you better talk to her before she goes off to the store.
4. To stop functioning. You better go look for coffee in another department—our pot went off before it was finished brewing.
5. To happen. Considering all the problems we had beforehand, it's amazing that our party went off so well!
6. To expire, as of food or drink. Don't eat those leftovers—they're a week old and have definitely gone off.
7. To stop taking a medication. Didn't the doctor tell you that you have to go off a medication like this gradually?
8. To become very angry, often unexpectedly. The boss just came into my office and went off on me for no apparent reason.
9. To talk about something at length. Grandpa went off on politics for so long that our dinner got cold.
10. To die. At Christmastime, I really miss the relatives who have gone off before us.
11. slang To orgasm. I don't think I'll sleep with him again—I didn't go off the last time.
go off (with someone)
to go away with someone. Tom just now went off with Maggie. I think that Maria went off with Fred somewhere.
1. Lit. [for an explosive device] to explode. The fireworks all went off as scheduled. The bomb went off and did a lot of damage.
2. Lit. [for a sound-creating device] to make its noise. The alarm went off at six o'clock. The siren goes off at noon every day.
3. Fig. [for an event] to happen or take place. The party went off as planned. Did your medical examination go off as well as you had hoped?
(by oneself) to go into seclusion; to isolate oneself. She went off by herself where no one could find her. I have to go off and think about this.
(into something) to go away to something; to depart and go into something. He went off into the army. Do you expect me just to go off into the world and make a living?
1. Explode, detonate; also, make noise, sound, especially abruptly. For example, I heard the gun go off, or The sirens went off at noon. This expression developed in the late 1500s and gave rise about 1700 to the related go off half-cocked, now meaning "to act prematurely" but originally referring to the slipping of a gun's hammer so that the gun fires (goes off) unexpectedly.
2. Leave, depart, especially suddenly, as in Don't go off mad, or They went off without saying goodbye. [c. 1600]
3. Keep to the expected plan or course of events, succeed, as in The project went off smoothly. [Second half of 1700s]
4. Deteriorate in quality, as in This milk seems to have gone off. [Late 1600s]
5. Die. Shakespeare used this sense in Macbeth (5:9): "I would the friends we missed were safely arrived.-Some must go off."
6. Experience orgasm. D.H. Lawrence used this slangy sense in Lady Chatterley's Lover (1928): "You couldn't go off at the same time...." This usage is probably rare today. Also see get off, def. 8.
7. go off on a tangent. See under on a tangent.
8. go off one's head. See off one's head. Also see subsequent idioms beginning with go off.
1. To go away: The children all went off to play at the park. Don't go off mad—let me explain!
2. To stop functioning. Used especially of electrical devices: The lights went off suddenly, and the performance began right away.
3. To occur, or be perceived as having occurred, in some particular manner: I think our party went off very well!
4. To adhere to the expected course of events or the expected plan: The project went off smoothly.
5. To stop taking some drug or medication: She went off painkillers a few weeks after the operation.
6. To make a noise; sound: The siren goes off every day at noon.
7. To undergo detonation; explode: If you push this red button, the bomb will go off.
8. go off on To begin to talk extensively about something: He went off on a series of excuses for his bad behavior.
9. go off on To berate someone directly and loudly: My boss really went off on me when she learned that I had forgotten to make the phone call.