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We'd better set off now before it gets dark.

When are you planning to set off?

set off

We set off for London just after ten.

This event set off a crisis. She'll set off for Warsaw in the evening. I have to set off early to get there.

You set off the alarm in the seat of my chair. It goes off when somebody tries to blow smoke up my rear.

What time did you set off?

Rob described Emma to Sophie and she set off one her errand.

I'm about to set off my new business

Wonder why,” said Ron sarcastically as they set off toward the Leaky Cauldron

Have you ever set off very early to catch a flight?

We had better set off soon, otherwise we’ll never get there!

begin a journey; set out/We set off at 5 o’clock.

Definition if you set off, you start a journey. If you set off for somewhere, you start your journey to go to that place

The daredevil set off on the journey into the middle of the jungle.