The difference between Black out and Darken

Black out as a verb (transitive):

To censor or cover up by writing over with black ink.

Black out as a verb (transitive, figuratively):

To censor or cover up.

Black out as a verb (intransitive):

To lose consciousness; to suffer a blackout.

Black out as a verb (transitive):

To obscure in darkness.

Darken as a verb (transitive):

To make dark or darker by reducing light.

Darken as a verb (intransitive):

To become dark or darker (having less light).

Darken as a verb (impersonal):

To get dark (referring to the sky, either in the evening or as a result of cloud).

Darken as a verb (transitive):

To make dark or darker in colour.

Darken as a verb (intransitive):

To become dark or darker in colour.

Darken as a verb (transitive):

To render gloomy, darker in mood.

Darken as a verb (intransitive):

To become gloomy, darker in mood.

Darken as a verb (transitive):

To blind, impair the eyesight.

Darken as a verb (intransitive):

To be blinded, lose one's eyesight.

Darken as a verb (transitive):

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

Darken as a verb (transitive):

To make foul; to sully; to tarnish.