Source : Webster's Revised Unabridged Dictionary (1913)

Dim \Dim\, v. t. [imp. & p. p. {Dimmed}; p. pr. & vb. n.
   {Dimming}.]
   1. To render dim, obscure, or dark; to make less bright or
      distinct; to take away the luster of; to darken; to dull;
      to obscure; to eclipse.

            A king among his courtiers, who dims all his
            attendants.                           --Dryden.

            Now set the sun, and twilight dimmed the ways.
                                                  --Cowper.

   2. To deprive of distinct vision; to hinder from seeing
      clearly, either by dazzling or clouding the eyes; to
      darken the senses or understanding of.

            Her starry eyes were dimmed with streaming tears.
                                                  --C. Pitt.

Source : WordNet®

dim
     adj 1: lacking in light; not bright or harsh; "a dim light beside
            the bed"; "subdued lights and soft music" [syn: {subdued}]
     2: 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" [syn: {faint},
         {shadowy}, {vague}, {wispy}]
     3: made dim or less bright; "the dimmed houselights brought a
        hush of anticipation"; "dimmed headlights"; "we like
        dimmed lights when we have dinner" [syn: {dimmed}] [ant: {undimmed}]
     4: 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" [syn: {black}, {bleak}]
     5: 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"
        [syn: {dense}, {dull}, {dumb}, {obtuse}, {slow}]
     [also: {dimming}, {dimmed}, {dimmest}, {dimmer}]

dim
     v 1: switch (a car's headlights) from a higher to a lower beam
          [syn: {dip}]
     2: become or make darker; "The screen darkend"; "He darkened
        the colors by adding brown" [syn: {darken}] [ant: {brighten}]
     3: become dim or lusterless; "the lights dimmed and the curtain
        rose"
     4: make dim or lusterless; "Time had dimmed the silver"
     5: make dim by comparison or conceal [syn: {blind}]
     6: become vague or indistinct; "The distinction between the two
        theories blurred" [syn: {blur}, {slur}] [ant: {focus}]
     [also: {dimming}, {dimmed}, {dimmest}, {dimmer}]

dimming
     See {dim}