Dictionary definition · dim
verb
- switch (a car's headlights) from a higher to a lower beam
- become dim or lusterless"the lights dimmed and the curtain rose"
- make dim or lusterless"Time had dimmed the silver"
- make dim by comparison or conceal
- become vague or indistinct"The distinction between the two theories blurred"
adjective
- lacking in light; not bright or harsh"a dim light beside the bed"
- lacking clarity or distinctness"a dim figure in the distance"
- made dim or less bright"the dimmed houselights brought a hush of anticipation"
- offering little or no hope"the future looked black"
- slow to learn or understand; lacking intellectual acuity"so dense he never understands anything I say to him"
Source: Open English WordNet (CC BY 4.0).