[v] make less visible or unclear; "The stars are obscured by the clouds"
befog, cloud, fog, haze over, mist, obscure
addle, addle the wits, ball up, bedarken, bedazzle, bedim, befog, befuddle, begloom, bemist, bewilder, black, black out, blacken, blanket, blind, block the light, blot out, blur, bother, brown, bug, camouflage, cast a shadow, clabber up, cloak, cloud, clo