To make or become crispy or firm by cooking or exposure to air.
Formed from 'crisp' (adjective) with the verb-forming suffix '-en', similar to how 'darken' comes from 'dark'. This pattern allows adjectives to become action verbs.
The suffix '-en' is one of English's oldest verb-making tools—you'll find it in 'frighten,' 'strengthen,' and 'dampen'—and it usually means 'to cause to become' or 'to grow'.
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