become vague or indistinct; "The distinction between the two theories blurred"
make dim by comparison or conceal
make dim or lusterless; "Time had dimmed the silver"
become dim or lusterless; "the lights dimmed and the curtain rose"
lacking in light; not bright or harsh; "a dim light beside the bed"; "subdued lights and soft music"
switch (a car's headlights) from a higher to a lower beam
made dim or less bright; "the dimmed houselights brought a hush of anticipation"; "dimmed headlights"; "we like dimmed lights when we have dinner"
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"