Fall for
Definition 1 of 2
Pro Tip 1/3Skepticism Needed
Question a story's truth before you fall for a possible deception. 
Despite the email's promises, she didn't fall for the phishing attempt.
Pro Tip 2/3Colloquial Use
Used informally, often in conversation, rather than in formal writing. 
He tried to make me fall for the old 'turtle on the fence post' yarn.
Pro Tip 3/3Detecting Lies
To not fall for something often shows cleverness or experience. 
The kids attempted to fool her with a tall tale, but she didn't fall for it.