• to cause an activity or event, often a series of events, to begin or happen:


    To set off sth meaning & definition 1 of To set off sth.


  • to cause a loud noise or explosion, such as that made by a bomb or an alarm (= a warning sound) to begin or happen:

    To set off sth meaning & definition 2 of To set off sth.

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This page shows you usage and meanings of To set off sth around the world.