To cast or cover over; hence, to cloud; to darken. [1913 Webster]
"Those clouds that overcast your morn shall fly." [1913 Webster]
To compute or rate too high. Bacon. [1913 Webster]
To take long, loose stitches over (the raw edges of a seam) to prevent raveling. [1913 Webster]
To fasten, as single sheets, by overcast stitching or by folding one edge over another. [Webster 1913 Suppl.]

overcast, a.

Completely or almost completely covered over with clouds; -- of the sky. [PJC]
Sewn by overcasting. [PJC]

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OXFORD DICTIONARY

overcast, adj., v., & n.
--adj.
1 (of the sky, weather, etc.) covered with cloud; dull and gloomy.
2 (in sewing) edged with stitching to prevent fraying.
--v.tr. (past and past part. -cast)
1 cover (the sky etc.) with clouds or darkness.
2 stitch over (a raw edge etc.) to prevent fraying.
--n. a cloud covering part of the sky.

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THESAURUS

overcast

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

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ROGET THESAURUS

overcast

Bubble

N bubble; cloud, bubble, foam, froth, head, spume, lather, suds, spray, surf, yeast, barm, spindrift, cloud, vapor, fog, mist, haze, steam, geyser, scud, messenger, rack, nimbus, cumulus, woolpack, cirrus, stratus, cirrostratus, cumulostratus, cirrocumulus, mackerel sky, mare's tale, dirty sky, curl cloud, frost smoke, thunderhead, nephelognosy, nephograph, nephology, effervescence, fermentation, bubbling, nebula, cloudliness, nebulosity, bubbling, frothy, nappy, effervescent, sparkling, mousseux, frothy, up, cloudy, thunderheaded, vaporous, nebulous, overcast, the lowring element scowls o'er the darkened lands.

Darkness

VB be dark, darken, obscure, shade, dim, tone down, lower, overcast, overshadow, eclipse, obfuscate, offuscate, obumbrate, adumbrate, cast into the shade becloud, bedim, bedarken, cast a shade, throw a shade, spread a shade, cast a shadow, cast a gloom, throw a shadow, spread a shadow, cast gloom, throw gloom, spread gloom, extinguish, put out, blow out, snuff out, doubt, turn out the lights, douse the lights, dim the lights, turn off the lights, switch off the lights.

N darkness, absence of light, blackness, obscurity, gloom, murk, dusk, Cimmerian darkness, Stygian darkness, Egyptian darkness, night, midnight, dead of night, witching hour of night, witching time of night, blind man's holiday, darkness visible, darkness that can be felt, palpable obscure, Erebus, the jaws of darkness, sablevested night, shade, shadow, umbra, penumbra, sciagraphy, obscuration, occultation, adumbration, obumbration, obtenebration, offuscation, caligation, extinction, eclipse, total eclipse, gathering of the clouds, shading, distribution of shade, chiaroscuro, noctivagation, black body, hohlraum, black hole, dark star, dark matter, cold dark matter, dark, darksome, darkling, obscure, tenebrious, sombrous, pitch dark, pitchy, pitch black, caliginous, black, sunless, lightless &c (sun) (light), somber, dusky, unilluminated &c (illuminate), nocturnal, dingy, lurid, gloomy, murky, murksome, shady, umbrageous, overcast, cloudy, darkened, dark as pitch, dark as a pit, dark as Erebus, benighted, noctivagant, noctivagous, in the dark, in the shade, brief as the lightning in the collied night, eldest Night and Chaos, ancestors of Nature, the blackness of the noonday night, the prayer of Ajax was for light.

Dimness

N dimness, darkness, paleness, half light, demi-jour, partial shadow, partial eclipse, shadow of a shade, glimmer, gliming, nebulosity, cloud, eclipse, aurora, dusk, twilight, shades of evening, crepuscule, cockshut time, break of day, daybreak, dawn, moonlight, moonbeam, moonglade, moonshine, starlight, owl's light, candlelight, rushlight, firelight, farthing candle, dim, dull, lackluster, dingy, darkish, shorn of its beams, dark, faint, shadowed forth, glassy, cloudy, misty, blear, muggy, fuliginous, nebulous, nebular, obnubilated, overcast, crepuscular, muddy, lurid, leaden, dun, dirty, looming, pale, confused.

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