Etymology Probably an assibilated form of Middle English fiken (“to jitter; move restlessly; hustle; flinch; hasten away”), perhaps related to Old English befician (“to deceive”) or from Old Norse fika (“to climb up nimbly, as a spider”), akin to Norwegian fika (“to strive after”), Swedish fika (“to strive for; hurry”). See also fike.
"Look, Jim, how my fingers fidges," he continued in the pleading tone. "I can't keep 'em still, not I. I haven't had a drop this blessed day. That doctor's a fool, I tell you. If I don't have a dram o' rum, Jim, I'll have the horrors..."1881–1882, Robert Louis Stevenson, Treasure Island, London; Paris: Cassell & Company, published 14 November 1883, →OCLC:
fidge
noun
Etymology Probably an assibilated form of Middle English fiken (“to jitter; move restlessly; hustle; flinch; hasten away”), perhaps related to Old English befician (“to deceive”) or from Old Norse fika (“to climb up nimbly, as a spider”), akin to Norwegian fika (“to strive after”), Swedish fika (“to strive for; hurry”). See also fike.