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

1.
piada final, remate
the final phrase or sentence of a joke or story, providing the humor or climax
:
•
Everyone laughed at the unexpected punch line.
Todos riram da piada final inesperada.
•
He delivered the punch line with perfect timing.
Ele entregou a piada final com um timing perfeito.