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touch off

B2 neutral separable transitive
In simple words

To start or cause something big to happen, usually with a small action.

Literal meaning: To touch the fuse of an explosive to set it off.

Meanings

1 B2 idiomatic neutral

To cause a large-scale event, conflict, or reaction to begin, often through a small or unexpected action.

"The assassination of the duke touched off a conflict that engulfed the entire continent."

"It was the shot that touched off the Great War."

Grammar: separable
2 C1 neutral

To fire or ignite a weapon or explosive by touching the trigger or fuse.

"The soldier touched off the flare to signal their position."

Grammar: separable
Usage notes

Often used to describe the starting of a serious conflict, riot, debate, or chain of events. The triggering action is typically small or unexpected compared to the scale of what follows. Common in journalism and historical writing. Derived from the action of touching a flame to a fuse.

Commonly used with

riots debate crisis war protests reaction

Forms

Base
touch off
I/you/we/they
3rd person
touches off
he/she/it
Past simple
touched off
yesterday
Past participle
touched off
have + pp
-ing form
touching off
continuous

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Synonyms

spark off set off trigger ignite provoke kick off

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