Meaning of the word "hook, line, and sinker" in English

What does "hook, line, and sinker" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

hook, line, and sinker

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

Idiom

completely; without reservation or doubt

Example:
He fell for the scam hook, line, and sinker.
She believed his story hook, line, and sinker.