hook, line and sinker
idiomPart ofhook
hook, line and sinker — idiom
1. completely, without doubt or hesitation — used to describe someone who believes
1.idiom
Definition
completely, without doubt or hesitation — used to describe someone who believes something entirely, especially a trick or lie.
Example
Linh fell for the prank hook, line and sinker, and spent ten minutes looking for a ghost in the garden.