*Après la pluie le beau temps = Every cloud has a silver lining.
Nous parlions de la pluie et du beau temps = We were talking of indifferent matters.
Il fait la pluie et le beau temps dans cette maison = His will is law in that house; He is the boss of that show (fam.).
Plus
*Plus on a, plus on veut avoir = Much would have more.
Poche
Il connaît Paris comme sa poche = He knows Paris perfectly; He knows all the ins and outs of Paris; His knowledge of Paris is extensive and peculiar.
Poil
Un brave à trois poils = The bravest of the brave; A hero of the first water.