Not born yesterday Meaning in English
expression
Definition
Used to say that you are not easily fooled and have enough experience to recognize a trick or lie.
Usage & Nuances
Informal and often used in a slightly defensive, humorous, or sarcastic way. Common in spoken English to reject manipulation or obvious lies. Do not use literally; it's an idiom meaning 'I'm not naive.' Often follows statements like 'Come on...' or 'You know...'
Example Sentences
Do you really think I believe that? I was not born yesterday.
basic
Nice try, but I'm not born yesterday.
basic
You can't fool me, I was not born yesterday.
basic
Come on, I’m not born yesterday—I know that’s a scam.
natural
When he offered the 'too good to be true' deal, she just smiled and said, 'I was not born yesterday.'
natural
If you expect me to fall for that excuse, remember, I’m not born yesterday.
natural