light off
B2 informal separable both
In simple words
To set something on fire to make it launch or explode, like a firework — or to leave fast.
Literal meaning: To apply a light (flame) so that something fires off — fairly transparent.
Meanings
1 B1 informal
To ignite a firework, rocket, or explosive device, causing it to fire or launch.
"The kids were excited to light off the fireworks after it got dark."
Grammar: separable
2 C1
idiomatic
informal
To leave suddenly or quickly (dialectal/archaic).
"He lit off down the road before anyone could ask him any questions."
Usage notes
Chiefly American English. In the sense of igniting fireworks or rockets, it is common in informal speech. The sense of departing quickly is dialectal and less common. Not to be confused with 'light up'.
Commonly used with
firework rocket firecracker flare fuse
Forms
Base
light off
I/you/we/they
3rd person
lights off
he/she/it
Past simple
lighted off
yesterday
Past participle
lighted off
have + pp
-ing form
lighting off
continuous
Understand "light off" better
Try:
Real video examples
Video examples are being collected. Check back soon.
Synonyms
Want to master this phrasal verb?
Practice "light off" on Looplines