punch line
US /ˈpʌntʃ ˌlaɪn/
UK /ˈpʌntʃ ˌlaɪn/

1.
clou, pointe
the final phrase or sentence of a joke or story, providing the humor or climax
:
•
Everyone laughed at the unexpected punch line.
Iedereen lachte om de onverwachte clou.
•
He delivered the punch line with perfect timing.
Hij bracht de clou met perfecte timing.