[The quotation comes from J. J. Rousseau’s Confessions, Part i., Bk. v.]
Borne
Il est planté là comme une borne = He stands there like a post.
Borner
Il faut savoir se borner = One must place limits on one’s desires.
[“Qui ne sait se borner ne sut jamais écrire.”
Boileau, Art Poétique, i.]
Bossu
Rire comme un bossu = To split one’s sides with laughter.
Botte
Il a mis du foin dans ses bottes = He has feathered his nest; He has taken care of number one.