"bulk" in the noun sense
1. majority, bulk
the property resulting from being or relating to the greater in number of two parts the main part
"the majority of his customers prefer it"
"the bulk of the work is finished"
2. bulk, mass, volume
the property of something that is great in magnitude
"it is cheaper to buy it in bulk"
"he received a mass of correspondence"
"the volume of exports"
3. bulk
the property possessed by a large mass
"bulk" in the verb sense
1. bulk
stick out or up
"The parcel bulked in the sack"
2. bulge, bulk
cause to bulge or swell outwards
Source: WordNet® (An amazing lexical database of English)
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