verb/pʁɑ̃.dʁə se ku.j‿ɑ̃ mɛ̃/
to grow some balls, to grow a pair (to gather up one's courage)
“J'avais bien compris qu'un truc clochait entre toi et moi. Et maintenant que t'as enfin pris tes couilles en main pour tout balancer, j'arrive à faire les liens.” — I knew something was off between you and me. And now that you've finally grown some balls and spilled the beans, I'm putting two and two together.
Synonyms: prendre son courage à deux mains
Literally, “to take one's balls in one's hand”.