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bulk (n.)

mid-15c., "a heap; the volume or bulk of something," earlier "ship's cargo" (mid-14c.), from a Scandinavian source akin to Old Norse bulki "a heap; ship's cargo," from Proto-Germanic *bul-, from PIE root *bhel- (2) "to blow, swell."

Meaning extended by early confusion with obsolete bouk "belly" (from Old English buc "body, belly," from Proto-Germanic *bukaz; see bucket), which led to sense of "size, volume, magnitude of material substance," attested from mid-15c. In bulk 1670s, "loaded loose." Meaning "the greater part" (of anything) is by 1711.

bulk (v.)

"swell, become more massive," 1550s (usually with up), from bulk (n.). Related: Bulked; bulking.

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Definitions of bulk from WordNet
1
bulk (n.)
the property resulting from being or relating to the greater in number of two parts; the main part;
the bulk of the work is finished
Synonyms: majority
bulk (n.)
the property of something that is great in magnitude;
it is cheaper to buy it in bulk
Synonyms: mass / volume
bulk (n.)
the property possessed by a large mass;
2
bulk (v.)
stick out or up;
The parcel bulked in the sack
bulk (v.)
cause to bulge or swell outwards;
Synonyms: bulge
From wordnet.princeton.edu