Meaning trap
set off
trigger something
to cause something to start happening, especially suddenly or unexpectedly.
Don't mix these meanings
Same phrase, different job.
to cause something to start happening, especially suddenly or unexpectedly.
Another meaning of 'set off' is 'start a journey'; compare the examples to keep the meanings separate.
Hear it in context
Notice where the phrase sounds natural.
- The smoke set off the fire alarm in the kitchen.technology
- Loud noises can sometimes set off anxiety in people, especially if they are sensitive to sound.IELTS speaking
Fix the pattern
Pattern: set off [noun]
WrongThe burnt toast set off to the alarm.
RightThe burnt toast set off the alarm.
'Set off' takes the thing triggered directly — no 'to'.
Patternset off [noun]
Use it right
Choose the version that sounds natural in speech.
'Set off' is the everyday verb for triggering something; 'activated' is technical.
Build natural chunks
Words that usually travel with it.
set off + triggerthe alarmfireworksa chain reactiona debate
Don't confuse it
'Set off' here means to trigger something, not to physically leave a place.
Related
- set off (start a journey) — Another meaning of 'set off' is 'start a journey'; compare the examples to keep the meanings separate.