Definition from Wiktionary, the free dictionary
- whatever, no matter what (even though) someone does/says, etc. (followed by an infinitive expressing the verb "do", "say", etc.)
on a beau faire ― whatever you do; no matter what one does
on a beau protester ― however much you protest
il a eu beau essayer ― try as he might
On a beau dire, il n'est pas bête. ― Say what you like, he's not stupid.