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Definition of dim
dim - adj. lacking in light; not bright or harsh; lacking clarity or distinctness; made dim or less bright; slow to learn or understand; lacking intellectual acuity; offering little or no hope; verb make dim or lusterless; become dim or lusterless; switch (a car's headlights) from a higher to a lower beam; become vague or indistinct; make dim by comparison or conceal; become or make darker.
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