Put one over on somebody

Pro Tip 1/3

Used in informal situations among friends, not for formal or serious conversations.

When he told me he owned a castle, I knew he was trying to put one over on me.

Pro Tip 2/3

Implies a negative judgment about the person deceiving; suggests dishonesty.

Don't trust her, she put one over on her last business partner.

Pro Tip 3/3

Encourages critical thinking to avoid being tricked or deceived by someone.

If something sounds too good to be true, they might be putting one over on you.