分ぶん解かい修しゅう理り

noun

overhaul; complete disassembly and repair

Refers to taking something apart completely for thorough repair or maintenance, often used for machinery, engines, or equipment.

• エンジンの分ぶん解かい修しゅう理りには専せん門もん的てきな知ち識しきが必ひつ要ようだ。

  A complete engine overhaul requires specialized knowledge.

• この時計とけいは分ぶん解かい修しゅう理りに出ださないと直なおらない。

  This watch won't be fixed unless I send it in for a complete disassembly and repair.