Definition

to set off: to leave, to depart; to begin, to start verb
I'm setting off for a six-month trip around Europe tomorrow morning.
to set (an alarm) off: to ignite, to activate (an alarm) verb
  • "In January of 1980, Bruno took the little money he had earned, packed his bags, and with his loyal dog Stink, set off to explore the world."
  • "Security guard : Please take off your belt - it will probably set the alarm off."
  • "Bruno took the little money he had earned, packed his bags, and with his loyal dog Stink, set off to explore the world."
  • "Edward : The bus set off, we were on our way"

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