Collect or gather.

synonyms: accumulate, conglomerate, cumulate, gather, pile up.

Roget 50: form a whole, constitute a whole; integrate, embody, amass; aggregate etc. (assemble) 72; amount to, come to.   

Roget 72: assemble [be or come together], collect, muster; meet, unite, join, rejoin; cluster, flock, swarm, surge, stream, herd, crowd, throng, associate; congregate, conglomerate, concentrate; precipitate; center round, rendezvous, resort; come together, flock get together, pig together; forgather; huddle; reassemble.    [get or bring together] assemble, muster; bring together, get together, put together, draw together, scrape together, lump together; collect, collocate, colligate^†; get, whip in; gather; hold a meeting; convene, convoke, convocate^†; rake up, dredge; heap, mass, pile; pack, put up, truss, cram; acervate^†; agglomerate, aggregate; compile; group, aggroup^†, concentrate, unite; collect into a focus, bring into a focus; amass, accumulate etc. (store) 636; collect in a dragnet; heap Ossa upon Pelion.    ... show more

Dutch: ophopen, opstapelen

Get or gather together:
— She is amassing a lot of data for her thesis.

synonyms: accumulate, collect, compile, hoard, pile up, roll up.

Roget 636: store; put by, lay by, set by; stow away; set apart, lay apart; store treasure, hoard treasure, lay up, heap up, put up, garner up, save up; bank; cache; accumulate, amass, hoard, fund, garner, save.    reserve; keep back, hold back; husband, husband one's resources.    deposit; stow, stack, load; harvest; heap, collect etc. 72; lay in store etc. Adj.; keep, file (papers); lay in etc. (provide) 637; preserve etc. 670.    ... show more

Dutch: opstapelen