to run into; to confront or attack
Non, tu vas rentrer dedans !
No, you're going to crash into it!
— Kin-dza-dza! (1986)
Je me suis fait rentrer dedans par un connard, tout à l'heure.
Some asshole rear-ended me earlier.
— Mommy (2014)
On va rentrer dedans ?
Are we going to get into it?
— Jurassic Park (1993)
Ils vont nous rentrer dedans.
They're going to crash into us.
— Le Salaire de la peur (1953)