darkening Definition

darken
verb

tr & intr
darkened, darkening
1. To make or become dark or darker.

Thesaurus: blacken, shade, shadow, cloud (over), eclipse, dim, obscure, overshadow, deepen; Antonym: brighten, lighten.

Derivative: darkened
adj

Idiom: darken someone's door

Note: often with negative, and implying that such an arrival would be unwelcome
To appear as a visitor.