A person who uses crutches, or a device that works with or supports a crutch.
From 'crutch' plus the agent suffix '-er', meaning 'one who uses.' This formation follows standard English patterns for creating occupational or user-based nouns.
The suffix '-er' is so powerful that English speakers can instantly understand new words—'crutcher' was rarely written down but anyone hearing it could immediately grasp that it meant a crutch-user.
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