boom off
C1 neutral inseparable intransitive
In simple words
To make a very loud, deep banging or echoing sound.
Literal meaning: A boom (deep loud sound) going off — both words reinforce the idea of a sudden, powerful sound.
Meanings
1 C1 neutral
To produce or emit a loud, deep booming sound, often echoing off surfaces.
"The signal cannon boomed off the stone battlements of the old fort."
Grammar: inseparable
Usage notes
Relatively rare and mostly found in literary or descriptive writing to convey the resonating effect of a very loud sound, such as a cannon, thunder, or explosion. The particle 'off' suggests the sound launching or reverberating away from its source.
Commonly used with
cannon thunder explosion guns drums walls
Forms
Base
boom off
I/you/we/they
3rd person
booms off
he/she/it
Past simple
boomed off
yesterday
Past participle
boomed off
have + pp
-ing form
booming off
continuous
Understand "boom off" better
Try:
Real video examples
Video examples are being collected. Check back soon.
Want to master this phrasal verb?
Practice "boom off" on Looplines