Definition of overcast adjective from the Oxford Advanced Learner's Dictionary

 

overcast

 adjective
adjective
BrE BrE//ˌəʊvəˈkɑːst//
 
; NAmE NAmE//ˌoʊvərˈkæst//
 
Sky
 
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covered with clouds; dull an overcast sky/day Today it will be dull and overcast. The sky was overcast and we needed to use artificial light. See related entries: Sky
See the Oxford Advanced American Dictionary entry: overcast