Princeton's WordNet

1. darken(verb)

   become dark or darker

   "The sky darkened"

2. darken(verb)

   tarnish or stain

   "a scandal that darkened the family's good name"

3. darken(verb)

   make dark or darker

   "darken a room"

Kernerman English Learner's Dictionary

1. darken(verb)ˈdɑr kən

   to become or make darker

   as the sky darkened; She darkened her hair.

Wiktionary

1. darken(Verb)

   To make dark or darker by reducing light.

2. darken(Verb)

   To become dark or darker (having less light).

3. darken(Verb)

   To make dark or darker in colour.

4. darken(Verb)

   To become dark or darker in colour.

5. darken(Verb)

   To render gloomy, dark(er) of mood

6. darken(Verb)

   To become gloomy, dark of mood

7. darken(Verb)

   To blind, impair eyesight

8. darken(Verb)

   To be blinded, loose clear vision

Webster Dictionary

1. Darken(adj)

   to make dark or black; to deprive of light; to obscure; as, a darkened room

2. Darken(adj)

   to render dim; to deprive of vision

3. Darken(adj)

   to cloud, obscure, or perplex; to render less clear or intelligible

4. Darken(adj)

   to cast a gloom upon

5. Darken(adj)

   to make foul; to sully; to tarnish

6. Darken(verb)

   to grow or darker

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