Il est sur le flanc = He is laid up, on his back.

Prêter le flanc à des reproches = To lay oneself open to reproaches.

Flétrir

*De rose flétrie nul ne soucie = The fading rose has no suitor.

Fleur

C’est la fine fleur de l’armée = It is the cream of the army.

L’affaire passa à fleur de corde = The matter only just succeeded.

Les yeux à fleur de tête = Goggle eyes (i.e. on a level with the cheek-bone and fore-head).

À fleur de terre = On a level (or, flush) with the ground.