not born yesterday

"You were not born yesterday, you understood exactly what you were doing," he said.

Because he was not born yesterday, Engoron is unlikely to believe that being female is an all-purpose preventative from buying into gender stereotypes, however.

I was not born yesterday, and the last few bogus trickle-down tax laws did not help me or anybody I know in any way.

Perhaps he was under the weather or had had a few cocktails but Kuttner was not born yesterday saw through his ploy. 

“I was not born yesterday,” Renu says.