The present participle of callus; the process of forming calluses or becoming hardened.
From 'callus' with the present participle suffix '-ing'. This represents the ongoing action of skin or emotion becoming harder and less sensitive.
Your skin is continuously callusing in response to your lifestyle—guitarists' fingertips, dancers' feet, and even desk workers develop protective hardening. It's a visible record written on your body of what you do repeatedly.
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