I.to cover with shade, to shade (class.; syn.: obscuro, obumbro).
I. Lit.; “platanus ad opacandum hunc locum patulis est diffusa ramis,” Cic. de Or. 1, 7, 28, cf. id. Fragm. ap. Macr. S. 6, 4: “ubi pinguem dives opacat Ramus humum,” Verg. A. 6, 195: “humum taxus opacat,” Luc. 6, 645: “(sol terras) modo his modo illis ex partibus opacat,” Cic. N. D. 2, 19, 49.—
B. Transf., to cover (poet.): opacat flore lanugo genas, Pac. ap. Fest. s. v. genas, p. 94 Müll.: “opacat tempora pinus,” Sil. 13, 331.—*
II. Trop., to darken, obscure, Aug. Mor. Eccl. Cath. 1, 2.