boum
/bum/
The English phrase "boom" is translated into French as boum.
boum is an onomatopoeic term used to imitate the sound of a loud noise or an explosion. In an informal context, une boum can also refer to a party or a dance, particularly one for children or teenagers. If you want to describe a dull sound, such as a car crash, you might use un bruit sourd. To express that something had a strong impact or was an unexpected event, you can use the idiomatic expression ça a fait l'effet d'une bombe.
Meaning: abrupt, low-pitched sound (noun)
Which one should you use?
While boum is an informal way to imitate a loud noise, more formal or specific terms exist. For a formal way to say boom, you can use explosion. If you are describing a loud and chaotic crashing or booming sound, the formal term fracas is appropriate. To specifically describe the sound of a thunderclap, use the formal term coup de tonnerre. In a playful, informal context, you can also use the variant badaboum to describe small explosions or impacts.
Is there a formal and an informal way to say it?
boum is an informal onomatopoeic term. For formal situations, use explosion for a loud noise, fracas for a chaotic crashing sound or coup de tonnerre for a thunderclap. Badaboum is an informal and playful variant.
How do you pronounce it?
/bum/
Did you know?
- In French, a 'dull' sound like un bruit sourd is described as 'deaf', using a word that English usually reserves for the inability to hear.
- The playful term badaboum is often used to describe a clumsy fall, effectively turning a heavy impact into a cartoonish accident.
- The term une boum for a party is specifically associated with the 1950s and 60s, evoking a sense of mid-century nostalgia for older generations.
Examples in context
- Le fracas des vagues contre les rochers était impressionnantThe crashing of the waves against the rocks was impressive
- J'ai entendu un boum très fortI heard a very loud boom
- Le ballon a éclaté, faisant un petit badaboumThe balloon burst, making a little boom
- un boom assourdissantA deafening boom
- un boom fracassantA shattering boom
Example conversation
Chloé and Lucas are talking about a noise they heard.
- ChloéTu as entendu ce boum ?Did you hear that boom?
- LucasOui, ça a fait peur.Yes, it was scary.
- ChloéJe pense que c'était un ballon.I think it was a balloon.
- LucasC'est possible, Lucas.That's possible, Lucas.
Sources
- Pronunciation: Wiktionary entry boum, CC BY-SA 4.0, dump of 2026-09-26.
