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bulk n. 1 [mass noun] the mass or size of something large: residents jump up and down on their rubbish to reduce its bulk. large size or shape: he moved quickly in spite of his bulk. [count noun] a large mass or shape. [as modifier] large in quantity: bulk orders of over 100 copies. roughage in food: potatoes supply energy, essential protein, and bulk. cargo in an unpackaged mass such as grain or oil. [PRINTING] the thickness of paper or a book. 2 (the bulk of) the greater part of something: the bulk of the traffic had passed. v. [with obj.] 1 treat (a product) so that its quantity appears greater than it is: traders were bulking up their flour with chalk. [no obj.] (bulk up) build up flesh and muscle, typically in training for sporting events. 2 combine (shares or commodities for sale): your shares will be bulked with others and sold at the best prices available. bulk large be or seem to be of great importance: territorial questions bulked large in diplomatic relations. in bulk 1 (of goods) in large quantities and generally at a reduced price: retail multiples buy in bulk. 2 (of a cargo or commodity) not packaged; loose. Middle English: the senses ‘cargo as a whole’ and ‘heap, large quantity’ (the earliest recorded) are probably from Old Norse búlki ‘cargo’; other senses arose perhaps by alteration of obsolete bouk ‘belly, body’. bulk buying
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