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le caisson

head, box, compartment, chamber

k ɛ . s ɔ̃
caiss car + on we, people, someone, they
noun · masculine Rare #51,007
head Colloquial; especially used in the expression faire sauter le caisson, meaning “to blow someone’s brains out.”
FR: Il s’est cogné le caisson en se levant.
EN: He bumped his head when he stood up.
box, compartment, chamber A boxlike enclosed space or container.
FR: Sortez les affaires du caisson.
EN: Take the things out of the compartment.

Vous comptez venir me faire sauter le caisson devant un wagon de témoins ?

Are you planning to come and blow my mind in front of a whole bunch of witnesses?

— Bullet Train (2022)

Sortez-le du caisson.

Take it out of the cabinet.

— Alien, le huitième passager (1979)

Il s’est fait sauter le caisson.

He blew his head off.

Et si nous le sortions du caisson ?

What if we took it out of the box?

— Space Seed (1967)

Sounds similar to

cassons k a . s ɔ̃