Etymology
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waist (n.)

late 14c., "middle part of the body," also "part of a garment fitted for the waist, portion of a garment that covers the waist" (but, due to fashion styles, often above or below it), probably from Old English *wæst "growth," hence, "where the body grows," from Proto-Germanic *wahs-tu- (source also of Old English wæstm, Old Norse vöxtr, Swedish växt, Old High German wahst "growth, increase," Gothic wahstus "stature," Old English weaxan "to grow" see wax (v.)), from PIE *wegs-, extended form of root *aug- (1) "to increase."

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Definitions of waist

waist (n.)
the narrowing of the body between the ribs and hips;
Synonyms: waistline
waist (n.)
the narrow part of the shoe connecting the heel and the wide part of the sole;
Synonyms: shank
From wordnet.princeton.edu