Reviewed by: David WestfallCofounder
To dry out and stiffen with age, especially skin
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Apergaminarse means to become parchment-like, like the paper-thin skin on an old person's hands. It is literally to turn yourself into pergamino1: dry, thin and stiff.
apergaminarse

to become parchment-like, to dry out (skin)
When someone's skin turns dry, thin and wrinkled, usually from age or years of sun.
Con los años se le apergaminó la piel de las manosOver the years the skin on his hands became parchment-like
Después de tantos veranos al sol, su rostro se ha apergaminadoAfter so many summers in the sun, her face has dried out

to go stiff, to grow brittle (materials)
When a material dries out until it goes stiff and brittle.
El cuero de la silla se apergaminó en el garajeThe leather of the chair went stiff and dry in the garage
Las hojas del cuaderno se apergaminaron con la humedadThe pages of the notebook grew brittle with the damp