Verbs

(v)accumulate, cumulate, conglomerate, pile up, gather, amassincrease in amount by collecting or gathering“Journals are accumulating in my office”, “The work keeps piling up”
(v)pile up, heap up, stack uparrange into piles or stacks“She piled up her books in my living room”
(v)roll up, collect, accumulate, pile up, amass, compile, hoardget or gather together“I am accumulating evidence for the man's unfaithfulness to his wife”, “She is amassing a lot of data for her thesis”, “She rolled up a small fortune”