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English definition of “dark”

dark

adjective [-er/-est only]  /dɑrk/ us  

dark adjective [-er/-est only] (WITHOUT LIGHT)

with little or no light, or having little brightness: It was too dark to see much of anything. What time does it get dark in the summer? Dark colors have less white in them: a dark blue dress dark hair/eyes

dark adjective [-er/-est only] (SAD)

unhappy or sad; gloomy: The report contains dark predictions about the future.

dark adjective [-er/-est only] (EVIL)

evil or threatening: He gave me a dark look when I criticized his work.
darkness
noun [U]  /ˈdɑrk·nəs/ us  
The city was plunged into darkness by the power blackout.

dark

noun [U]  /dɑrk/ us  

dark noun [U] (ABSENCE OF LIGHT)

the absence of light: Does eating carrots really help you to see in the dark? She arrived home well before/after dark (= before/after the sun had gone down).
(Definition of dark from the Cambridge Academic Content Dictionary © Cambridge University Press)
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