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to set off
[phrase form: set]
01
to make something operate, especially by accident
Transitive: to set off a system or mechanism
Examples
Please do n't set off the car alarm while I'm inside; the keys are on the seat.
02
to start a journey
Intransitive: to set off on a journey | to set off for a journey
Examples
We 'll set off on our cross-country journey early in the morning to avoid traffic.
03
to activate a bomb, an explosive, etc.
Intransitive
Transitive: to set off an explosive
Examples
The demolition expert carefully set the explosives off to bring down the old building.
04
to complement the appearance of something, making it look more appealing
Transitive: to set off appearance of something
Examples
The dress you 're wearing really sets off your eyes.
05
to be the first cause of a chain of events, actions, or reactions that unfold unexpectedly
Transitive: to set off events or actions
Examples
Her comments about the topic set off a heated debate among the participants.
06
to subtract certain expenses from one's tax amount
Transitive: to set off an expense
Examples
By carefully documenting their business expenses, entrepreneurs can set off a significant portion of their taxable income.
07
to intentionally provoke a reaction or response
Transitive: to set off a reaction
Examples
The news of the scandal set off widespread outrage among the public.
