détaper

A rare, mostly regional and technical verb with several narrow senses: in traditional seamanship, to remove the cork tampons plugging a cannon's mouth; in sugar refining, to remove the molds from sugar loaves; and, in everyday Québécois French, to peel adhesive tape off an object. Outside Canada, most French speakers today would not recognize the everyday sense.

• Au Québec, on dit détaper une boîte pour enlever le ruban adhésif. — In Quebec, people say 'détaper une boîte' for peeling the tape off a box.
• L'artilleur détape le canon avant de tirer. — The gunner removes the tampon from the cannon before firing.
• Le raffineur détape les formes une fois le sucre solidifié. — The refiner removes the molds once the sugar has solidified.

This verb's meaning depends heavily on region and context (marine, sugar industry, or Québécois everyday speech) — don't assume a single universal sense the way you would with a common verb like ouvrir.