Meaning

• 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 explode metaphorically; to become very angry.

  "It all went off when the opposing teams' fans met at the railway station."

• To begin clanging or making noise.

  "Just after he spotted the first plane on the horizon, sirens started to go off around the city."

• To stop operating; to switch off.

  "We were watching TV when suddenly the power went off."

• To depart; to leave.

  "Having sated her appetite, she went off in search of a place to sleep."

• To putrefy or become inedible, or to become unusable in any way.

  "Bugger—the milk's gone off already!"

• To like less.

  "Ever since falling off her bike, she's gone off cycling to work."

• To pass off; to take place; to be accomplished.

  "The party went off very well."

• To ejaculate.