colle

glue; oral examination at a prépa or during the PASS; conundrum, stumper (difficult question); detention

“La khôlle (ou colle) est une interrogation orale d'une heure devant un tableau. On vous donne un exercice et vous avez pour mission de le résoudre (même si ce n'est pas le plus important).” — The khôlle (or colle) is an hour-long oral examination in front of a blackboard. You are given an exercise and your mission is to solve it (although solving it is not the most important thing).

Inherited from Vulgar Latin colla, from Ancient Greek κόλλα (kólla, “glue”). Compare Italian colla, Portuguese and Spanish cola.