HOOK, LINE AND SINKER

{adv. phr.}, {informal} Without question or doubt; completely. * /Johnny was so easily fooled that he fell for Joe's story, hook, line and sinker./ * /Mary was such a romantic girl that she swallowed the story Alice told her about her date, hook, line and sinker./ * /Bobby trusted Jim so he was taken in by his hard-luck story hook, line and sinker./