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

inflection of coller:
/ inflection of coller:

flypaper

plural of papier colle-mouches

gluepot / a clinging vine, a clingy person, a tagger-along, a cling-on, a leech

(informal, transitive with à) to bowl a googly, to set a poser, to stump, to ask a toughie (to ask someone a question they are unable to answer)

collection

plural of collection

inflection of collecter:
/ inflection of collecter:

feminine singular of collectif