Having calluses; having thick, hardened areas of skin from repeated friction or pressure.
From 'callus' (Latin callus, meaning hardened skin) plus the past participle suffix '-ed'. The word evolved from physical descriptions of toughened skin into metaphorical uses for emotional hardening.
Calluses are actually your body's smart engineering—when skin experiences repeated stress, it builds extra layers of protection. Athletes and musicians develop calluses as battle scars of their craft, making their hands literally tougher than untrained hands.
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