[adjective oh-ver-kast, -kahst, oh-ver-kast, -kahst; verb oh-ver-kast, -kahst, oh-ver-kast, -kahst; noun oh-ver-kast, -kahst]
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  1. overspread or covered with clouds; cloudy: an overcast day.
  2. Meteorology. (of the sky) more than 95 percent covered by clouds.
  3. dark; gloomy.
  4. Sewing. sewn by overcasting.
verb (used with object), o·ver·cast, o·ver·cast·ing.
  1. to overcloud, darken, or make gloomy: Ominous clouds began to overcast the sky.
  2. to sew with stitches passing successively over an edge, especially long stitches set at intervals to prevent raveling.
verb (used without object), o·ver·cast, o·ver·cast·ing.
  1. to become cloudy or dark: By noon it had begun to overcast.
  1. Meteorology. the condition of the sky when more than 95 percent covered by clouds.
  2. Mining. a crossing of two passages, as airways, dug at the same level, in which one rises to pass over the other without opening into it.Compare undercast(def 1).

Origin of overcast

1175–1225; Middle English (v.); see over-, cast
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for overcast


adjective (ˈəʊvəˌkɑːst)
  1. covered over or obscured, esp by clouds
  2. meteorol (of the sky) more than 95 per cent cloud-covered
  3. gloomy or melancholy
  4. sewn over by overcasting
verb (ˌəʊvəˈkɑːst)
  1. to make or become overclouded or gloomy
  2. to sew (an edge, as of a hem) with long stitches passing successively over the edge
noun (ˈəʊvəˌkɑːst)
  1. a covering, as of clouds or mist
  2. meteorol the state of the sky when more than 95 per cent of it is cloud-covered
  3. mining a crossing of two passages without an intersection
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for overcast

c.1300, of weather, past participle adjective from verb overcast (early 13c.), "to overthrow," also "to cover, to overspread" as with a garment, usually of weather, from over- + cast (v.).

Online Etymology Dictionary, © 2010 Douglas Harper