bucket (n.) Look up bucket at Dictionary.com
"pail or open vessel for drawing and carrying water and other liquids," mid-13c., from Anglo-French buquet "bucket, pail," from Old French buquet "bucket," which is from Frankish or some other Germanic source, or a diminutive of cognate Old English buc "pitcher, bulging vessel," originally "belly" (buckets were formerly of leather as well as wood), both from West Germanic *buh- (source also of Dutch buik, Old High German buh, German Bauch "belly"), possibly from a variant of PIE root *beu-, *bheu- "to grow, swell" (see bull (n.2)).

To kick the bucket "die" (1785) perhaps is from an unrelated bucket "beam on which something may be hung or carried" (1570s), from French buquet "balance," a beam from which slaughtered animals were hung (by the heels or hooves). This was perhaps reinforced by the notion of suicide by hanging after standing on an upturned bucket; but Farmer calls attention to bucket "a Norfolk term for a pulley."