Verb
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become vague or indistinct
"The distinction between the two theories blurred"
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make dim by comparison or conceal
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make dim or lusterless
"Time had dimmed the silver"
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become dim or lusterless
"the lights dimmed and the curtain rose"
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switch (a car's headlights) from a higher to a lower beam
Adjective
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slow to learn or understand
lacking intellectual acuity
"so dense he never understands anything I say to him"
"never met anyone quite so dim"
"although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray
"dumb officials make some really dumb decisions"
"he was either normally stupid or being deliberately obtuse"
"worked with the slow students"
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offering little or no hope
"the future looked black"
"prospects were bleak"
"Life in the Aran Islands has always been bleak and difficult"- J.M.Synge
"took a dim view of things"
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made dim or less bright
"the dimmed houselights brought a hush of anticipation"
"dimmed headlights"
"we like dimmed lights when we have dinner"
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lacking clarity or distinctness
"a dim figure in the distance"
"only a faint recollection"
"shadowy figures in the gloom"
"saw a vague outline of a building through the fog"
"a few wispy memories of childhood"
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lacking in light
not bright or harsh
"a dim light beside the bed"
"subdued lights and soft music"