stack

stack up

verb

Definition of STACK

to gradually form into a layer, pile, or mass <those newspapers have been stacking up in the basement since we moved here>

Synonyms accrete, accumulate, amass, build up, concentrate, conglomerate, gather, mass, pile (up), stack (up)

Related Words agglutinate, clump, lump; bank, drift, ridge

Near Antonyms disperse, dissipate, scatter