Definition from Wiktionary, the free dictionary
- whatever/no matter what 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.