hook, line, and sinker

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.
Categories: doubt {adv. phr.} {informal}