1. (v. t.) To cast or cover over; hence, to cloud; to darken.

2. (v. t.) To compute or rate too high.

3. (v. t.) To take long, loose stitches over (the raw edges of a seam) to prevent raveling.

Acheronian Acherontic CAT Cimmerian Stygian adumbrate aerospace aerosphere air hole air pocket airspace becloud bedarken bedim befog begloom bemist black black out blacken blackening blanket block the light blocking the light blot out brooding brown bump cap cast a shadow castellatus ceiling cirrose cirrous clabber up cloud cloud over cloud up cloud-flecked clouded cloudiness clouding cloudy crosswind crown cumuliform cumulous dark dark and gloomy darken darken over darkened darkening dim dim out dimming dirty dirty sky dismal dreary dull eclipse eclipsing empty space encloud encompass with shadow enmist extinguishment favorable wind fog fogginess front funereal gloom gloomful glooming gloomy grey haze haziness head wind heavy heavy sky high-pressure area hole ill-lighted ill-lit ionosphere jetstream lenticularis low-pressure area lowering mammatus menacing mist mistiness murk murky nebulosity nebulous nimbose nimbosity nubilate nubilation nubilous obfuscate obfuscation obnubilate obnubilation obscuration obscure obscurement obumbrate obumbration occult occultate occulting oppressive overcloud overclouded overclouding overlay overshading overshadow overshadowing overshadowment oversmoke overspread pocket roughness shade shading shadow shadowing smog smoke somber sombrous soup space squally starless stormy stratiform stratosphere stratous substratosphere sullen sunless tail wind threatening thunderheaded tropopause troposphere trough turbulence visibility visibility zero