Made something crispy or brittle by cooking or drying it out.
From 'crisp' (Latin crispus meaning curled or wrinkled) plus the past tense suffix '-ed'. The word evolved from describing the wavy texture of curled things to describing foods that are hard and snappy.
Interestingly, the word 'crisp' originally described how Roman hair looked when it was curled—and you can still see that 'wavy, textured' sense in how we describe crispy foods that have a crackly, uneven surface.
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