To grasp or grip something tightly; dialectal or archaic form meaning to clutch or hold firmly.
Possibly from grip with variant spelling or phonetic variation, combined with -ing (present participle). Relates to dialectal uses of grasp and grip in English.
Obscure verbs like 'grisping' remind us that English had rich regional variations before standardization—every region probably had its own way of describing the simple act of grabbing something.
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