dim Definition in Cambridge American English Dictionary
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Definition of "dim" - American English Dictionary

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dimadjective [-er/-est only]

 us   /dɪm/ (-mm-)
not bright; not giving or having much light: A dim bulb provides the only light in the hall. Something that is dim is also not clear in your mind or memory or not likely to happen: I had only a dim memory of a tall, slender man.
dimly
adverb  us   /ˈdɪm·li/
a dimly lit hallway

dimverb [I/T]

 us   /dɪm/ (-mm-)
to become or make something less bright: [I] In the middle of the storm, the lights suddenly dimmed.
(Definition of dim from the Cambridge Academic Content Dictionary © Cambridge University Press)
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