ne pas croire si bien dire

• IPA^(key): /nə pa kʁwaʁ si bjɛ̃ diʁ/, /nə pɑ kʁwaʁ si bjɛ̃ diʁ/

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ne pas croire si bien dire

1. not to know how right one is (said when someone who has uttered a statement doesn't know that this statement is even truer than they thought, for example because there is another dimension to it that they weren't aware of)

   Tu ne crois pas si bien dire ! ― If only you knew how right you are! That's an understatement!