Lewis & Short

col-lĭquesco (conl-), lĭqui, ĕre, v. inch. n., to become fluid, to liquefy, melt, dissolve (rare).

  1. I. Prop.: cum aurum colliquisset, Varr. ap. Non. p. 334, 27 sq.: cum aes colliquisset, id. ib. (but Neue, Formenl. 2, 486, would read collicuisset in both these passages): in pice colliquescere, Col. 12, 22, 2: igni, App. Mag. p. 306, 10.
  2. II. Trop.: lacrimis, to melt into tears, Fronto, Nep. Am. 2.