vinaigre

/vinɛgʁ/
1.
nounmasculine

vinegar

Ajoute un peu de vinaigre à la sauce.

Add a little vinegar to the sauce.

2.
adjective

sour, acerbic (figurative — of tone, expression, or temperament)

Il avait un air un peu vinaigre ce matin.

He had a rather sour/acerbic look this morning.