À la fleur de l’âge = In the prime of life.
Il a les nerfs à fleur de peau = His nerves are always on the twitch; He is extremely sensitive.
Fleurette
Conter fleurettes = To say soft nothings.
*Ce qui vient de la flûte s’en va au tambour = Lightly come, lightly go; What is dishonestly acquired is easily dissipated.
Foi
C’est un homme sans foi ni loi = He is a man without honour or honesty.
Il est de peu de foi = He is not to be trusted.
Ses ouvrages en font foi = His works prove it.