nubilare

nubilare [CL] 1 (intr.) to cloud over, become dim. adhuc Benna hortatur ut ~antes acies ipsa per se abluere non dedignetur Gosc. Edith 272. 2 (trans) to obscure, darken. ignis innocuus in rubo rutilat / nec rubum nubilo fumali nubilat Walt. Wimb. Carm. 87.