noun

the mass or size of something large.

residents jump up and down on their rubbish to reduce its bulk

size,volume,dimensions,measurements,proportions,mass,substance,scale,magnitude,immensity,hugeness,vastness,massiveness,bulkiness,largeness,bigness,ampleness,amplitude

verb

treat (a product) so that its quantity appears greater than it is.

traders were bulking up their flour with chalk

make bigger,make larger,expand,pad out,fill out,eke out,add to,augment,increase