Lewis & Short

ac-cŭmŭlo (adc.), āvi, ātum, 1, v. a. [cumulus], to add to a heap, to heap up, accumulate, to augment by heaping up (mostly poetical).

  1. I. Lit.
    1. A. In gen.: ventorum flatu congeriem arenae accumulantium, Plin. 4, 1, 2: confertos acervatim mors accumulabat, Lucr. 6, 1263.
      Absol., of heaping up money: auget, addit, adcumulat, * Cic. Agr. 2, 22, 59. (The syn. augere and addere are used of any object, although still small, in extent or number, after the increase; but adcumulare only when it becomes of considerable magnitude; hence the climax in the passage quoted from Cic.)
    2. B. Esp., botan. t. t., to heap up earth round the roots of plants, to trench up, Plin. 17, 19, 31, § 139; 18, 29, 71, § 295; 19, 5, 26, § 83 al.
  2. II. Trop., to heap, add, increase: virtutes generis meis moribus, Epitaph of a Scipio in Inscr. Orell. no. 554: caedem caede, to heap murder upon murder, Lucr. 3, 71: aliquem donis, to heap offerings upon one, Verg. A. 6, 886: honorem alicui, Ov. F. 2, 122: curas, id. H. 15, 70.
    Absol.: quod ait (Vergilius) sidera lambit (A. 3, 574), vacanter hoc etiam accumulavit et inaniter, has piled up words, Gell. 17, 10, 16.
    Hence, accŭmŭlāte, adv., abundantly, copiously (very rare): id prolixe accumulateque fecit, Cic. Fl. 89: accumulate largiri, Auct. Her. 1, 17 fin.: prolixe accumulateque pollicetur, App. M. 10, p. 212.