louper

/lupe/louper
1.
verbInf1st

miss (a transport, appointment, event)

miss out on (an opportunity)

Dépêche‑toi sinon on va louper le train.

Hurry up or we'll miss the train.

2.
verbInf1st

mess up; fail; botch (colloquial)

J'ai complètement loupé mon exposé.

I completely messed up my presentation.