hook, line, and sinker
US /hʊk laɪn ənd ˈsɪŋkər/
UK /hʊk laɪn ənd ˈsɪŋkər/

1.
por completo, totalmente, sin reservas
completely; without reservation or doubt
:
•
He fell for the scam hook, line, and sinker.
Cayó en la estafa por completo.
•
She believed his story hook, line, and sinker.
Ella creyó su historia por completo.