hook, line, and sinker= used to emphasize that someone has been completely deceived or tricked=completely, totally, شخصی که کاملا فریب خورده/ اصطلاح به دام افتادن/ تمام و کمال What I told him was not true, but he fell for it hook, line and sinker چیزی که بهش گفتم حقیقت نداشت ولی او کاملاً باورش کرد