naive; inexperienced
someone, like a new born baby with no experience
to be stupid or easy to mislead
not a completely naive person
well experienced person
when someone cannot easily be tricked
when someone is more experienced than they appear to be
someone who is not gullible
Susan might look young, but she was not born yesterday. She is not going to fall for your lies.
My mom will never fall for it if I say that your parents are home. She was not born yesterday.
I don’t believe that your dog ate your homework Pete. I was not born yesterday.
“I am not paying that amount of money for a second-hand car! I was not born yesterday.”
If you don’t know how to use the computer, then it’s as if you were born yesterday. (Positive Example.)
He thought he can fool me, but I wasn’t born yesterday and I understand his tricks well.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.