d'un poil

by a hair; not one bit

→ de
phrase Rare #42,461
by a hair; not one bit With verbs like perdre, it means “by a hair” or “by a whisker.” In the expression ne pas bouger/changer d'un poil, it means “not move/change one bit.”
FR: L'équipe a gagné d'un poil.
EN: The team won by a hair.

Tu n'as pas changé d'un poil.

You haven't changed a bit.

Tu bouges pas d'un poil.

Don't move an inch.

— La Famille Tenenbaum (2001)

J'ai perdu d'un poil.

I lost by a hair.

— Devdas (2002)

Tu perds toujours d'un poil.

You always lose by a hair.

— Devdas (2002)