dépolir

To remove the shine or gloss from a surface, most often glass — verre dépoli (frosted glass, opaque for privacy) is the form learners meet constantly, in bathroom windows and shower doors, far more than the finite verb itself.

• Le sablage a permis de dépolir la vitre de la salle de bain. — Sandblasting frosted the bathroom window glass.
• Le temps a fini par dépolir cette vieille bouteille. — Time eventually dulled the shine of this old bottle.
• Ils ont dépoli le verre pour préserver l'intimité. — They frosted the glass to preserve privacy.

Learners meet the adjective dépoli (as in verre dépoli, frosted glass) constantly but rarely the finite verb — don't over-conjugate it in speech when the adjective alone would do.