éplucher des vieux légumes

to keep bringing up old grudges

Used for someone who won't let an old quarrel rest and keeps digging up grievances that should have been forgotten.

Arrête d'éplucher des vieux légumes, cette chicane-là est réglée depuis longtemps.

Stop dragging up old grudges, that argument was settled ages ago.

Quebec French kept an old figurative sense of "éplucher" (to go over something with a critical eye) that goes back to the 13th century, and paired it with the more familiar 16th-century sense of peeling away a vegetable's useless parts.

Quebec