Definition of one wasn't born yesterday in English:

one wasn't born yesterday

phrase

  • Used to indicate that one is not foolish or gullible.

    ‘I may sell Bibles but I know which end is up and I wasn't born yesterday and I know where I'm going!’
    • ‘Listen, I wasn't born yesterday… you think that if you're nice to Jeremy he'll open up to you and that's when you strike in for the kill.’
    • ‘Now Pet, you of all people know I wasn't born yesterday.’
    • ‘Unless time and space are incredibly unstable, I wasn't born yesterday, and I don't fall for tricks.’
    • ‘Just because I was in pain didn't mean I was an idiot; I wasn't born yesterday.’