1. To make something less bright.
    He dimmed the lights and put on soft music.
  2. To become darker.
    The lights dimmed briefly when the air conditioning was turned on.
  3. 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.
  4. To deprive of distinct vision; to hinder from seeing clearly, either by dazzling or clouding the eyes; to darken the senses or understanding of.


  1. Not bright or colorful.
    The lighting was too dim for me to make out his facial features.
  2. Not smart or intelligent.
    He may be a bit dim, but he's not retarded.
  3. Indistinct, hazy or unclear.
    His vision grew dimmer as he aged.
  4. Disapproving, unfavorable:

The above text is a snippet from Wiktionary: dim
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