les fers

shackles, chains, handcuffs, irons (in “too many irons in the fire”)

→ fer
fer iron + s Plural
noun · plural masculine Rare #44,548
shackles, chains, handcuffs Usually used in the plural when referring to restraints.
FR: La police lui a mis les fers aux poignets.
EN: The police put handcuffs on him.
irons (in “too many irons in the fire”) Used in the expression « avoir trop de fers au feu », meaning to have too many things going on at once.
FR: J’ai déjà trop de fers au feu.
EN: I already have too many irons in the fire.
Declension of fer
ferfers

Vous avez trop de fers au feu.

You have too many irons in the fire.

Tu as trop de fers au feu.

You have too many irons in the fire.

L'homme est né libre, et partout il est dans les fers.

Man is born free, and everywhere he is in chains.

Mets-le aux fers !

Put him in irons!

— Aguirre, la colère de Dieu (1972)

Je suis mieux enchaîné par son assurance que mes fers.

I am more tightly bound by his confidence than by my chains.

— Army of Shadows (1969)

Il a fallu lui mettre les fers, il se présentait par les fesses.

We had to put him in irons, he was presenting himself buttocks first.

— Les Quatre Cents Coups (1959)