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1925, "a crippled leg," also "a crippled person," perhaps by association with limp, or a corruption of gammy (see game (adj.)).
also gymp, ornamental material for trimming dresses, furniture, etc., 1660s, from French guimpe, Old French guimple "wimple, headdress, veil," from a Germanic source (cf. Old High German wimpal).
A competent and efficient airman
[1940s+ Air Force; see early 1900s British Army phrase gimp up, ''dress oneself up smartly,'' fr British dialect gimp, ''neat'']
: The old guy was gimping across the street