darken

verb12

1. •
   To make dark or darker by reducing light.

   • […] they [locusts] covered the face of the whole earth, so that the land was darkened […] — 1611
2. •
   To become dark or darker (having less light).

   • […] the owl and the bat flew round the darkening trees: — 1783
3. •
   To get dark (referring to the sky, either in the evening or as a result of cloud).

   • Well, I must go in now; and you too: it darkens. — 1847
4. •
   To make dark or darker in colour.

   • She puts on lipstick and darkens her eyebrows, which are now very scanty […] — 2009
5. •
   To become dark or darker in colour.

   • The lovely hair had lost its rose-gold glimmer, and had darkened to rose-brown […] — 1979
6. •
   To render gloomy, darker in mood.

   • With these forced thoughts, I prithee, darken not The mirth o’ the feast. — 1610
7. •
   To become gloomy, darker in mood.

   • His countenance darkened while he spoke […] — 1797
8. •
   To cloud, obscure, or perplex; to render less clear or intelligible.

   • Who is this that darkeneth counsel by words without knowledge? — 1611
9. •
   To make foul; to sully; to tarnish.

   • I must not think there are Evils enow to darken all his goodness: — 1606
10. •
    To blind, impair the eyesight.

    • Let their eyes be darkened, that they may not see […] — 1611
11. •
    To be blinded, lose one’s eyesight.
12. •
    To be extinguished or deprived of vitality, to die.

    • The Danube to the Severn gave ⁠The darken’d heart that beat no more; ⁠They laid him by the pleasant shore, And in the hearing of the wave. — 1850