hook, line, and sinker

US /hʊk laɪn ənd ˈsɪŋkər/
UK /hʊk laɪn ənd ˈsɪŋkər/
"hook, line, and sinker" picture
1.

completely; without reservation or doubt

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