set off
Intermediate (B1) neutral
To start a trip, to make something like an alarm or firework go off, or to cause a strong reaction.
"They set off early to avoid the rush-hour traffic on the motorway."
Hear it in context
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So, we all set off.
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immediately set off, his men
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Intrigued, Texier set off at once.
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So, she set off on a
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(It's time to set off.)