Meaning of the word "fool me once, shame on you; fool me twice, shame on me" in English

What does "fool me once, shame on you; fool me twice, shame on me" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

fool me once, shame on you; fool me twice, shame on me

US /fuːl mi wʌns, ʃeɪm ɒn juː; fuːl mi twaɪs, ʃeɪm ɒn miː/
UK /fuːl miː wʌns, ʃeɪm ɒn juː; fuːl miː twaɪs, ʃeɪm ɒn miː/
"fool me once, shame on you; fool me twice, shame on me" picture

Idiom

a proverb meaning that if someone deceives you once, it is their fault, but if they deceive you again in the same way, it is your own fault for being gullible

Example:
He lied to me again, but I should have known better. Fool me once, shame on you; fool me twice, shame on me.
I won't invest in his company again after the first failure; fool me once, shame on you; fool me twice, shame on me.