dim /dɪm/verb 5adjective 5noun 1forms 6phrases 4 verb5 •To make something less bright.He dimmed the lights and put on soft music. •To become darker.The lights dimmed briefly when the air conditioning was turned on. •To render dim, obscure, or dark; to make less bright or distinct.a king among his courtiers,[…] who out to dim the lustre of all his attendants — 1695 •(figurative) To diminish, dull, or curtail.All these setbacks had started to dim the hopes of the students.Nothing will dim their spirit of resilience. •To deprive of distinct vision; to hinder from seeing clearly, either by dazzling or clouding the eyes; to darken the senses or understanding of.And with our Sun-bright armour as we march, Weel chase the Starrs from heauen, and dim their eies That stand and muse at our admyred armes. — 1587 adjective5 •Not bright or colorful.The lighting was too dim for me to make out his facial features. •Indistinct, hazy or unclear.His vision grew dimmer as he aged. •Disapproving, unfavorable: rarely used outside the phrase take a dim view of. •(informal) Not smart or intelligent.He may be a bit dim, but he's not entirely stupid. •Clipping of diminished. noun1 •(no longer used) Dimness.All about me the Red Weed clambered among the ruins, writhing to get above me in the dim. Night, the Mother of Fear and Mystery, was coming upon me. — 1898 formsdimmed · dimming · dimmeth · dims · dimmer · dimmest Phrases with dim dim-wittedBeing a dimwit; stupid; foolish; simple. dim and distantOf a very long time ago, so as to be almost forgotten. dim outTo dim (lights) until they are totally off take a dim view ofTo dislike; to regard with skepticism, disbelief, disfavor, etc.