décheviller

A specialized carpentry and cabinet-making term meaning to remove the wooden dowels (chevilles) holding a joined piece of furniture together (décheviller une armoire) — the reverse of cheviller, to peg pieces together with dowels.

• Le restaurateur décheville la commode avant de la démonter entièrement. — The restorer removes the dowels from the chest of drawers before taking it fully apart.
• Il faut décheviller cet assemblage sans abîmer le bois. — This joint needs to be un-dowelled without damaging the wood.
• Une fois la commode dechevillée, chaque planche peut être traitée séparément. — Once the chest of drawers has had its dowels removed, each board can be treated separately.

Purely a woodworking and furniture-restoration term — a learner will only meet it in a carpentry context, and should not confuse it with décheveler (to dishevel someone's hair), an unrelated word that merely looks similar.