To wrinkle or form wrinkles on a surface; to create a ridged or furrowed pattern.
From Latin corrugare meaning to wrinkle together, from com- (together) plus rugare (to wrinkle), from ruga (wrinkle). The ber- prefix may indicate intensity or a variant of the Latin prefix.
The root 'rugae' (wrinkles) also shows up in the ridges in your mouth called rugae palatinae—your mouth literally has natural wrinkles, and Latin speakers thought wrinkles were important enough to name them!
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