trick or treat
US /trɪk ɔr triːt/
UK /trɪk ɔr triːt/

1.
truco o trato
a Halloween custom in which children in costume visit houses and ask for treats, threatening to play tricks if they do not get them
:
•
The children went from door to door, shouting "Trick or treat!"
Los niños iban de puerta en puerta, gritando "¡Truco o trato!"
•
Every Halloween, my kids love to go trick or treating.
Cada Halloween, a mis hijos les encanta ir a pedir truco o trato.