overcast

US /ˈoʊ.vɚ.kæst/
UK /ˈoʊ.vɚ.kæst/
1.

with clouds in the sky and therefore not bright and sunny:

:
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The sky/weather was overcast.
1.

(of clouds) to cover the sky so it is not bright and sunny:

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Thick clouds overcast the sky.