Darkle v. i. : To grow dark; to show indistinctly.

Example:
How do you get rid of darkling beetles in your home?

Taxonomy
Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, Google Search, Custom Search, glossary, english, language, ESL, Search, kle, där, intransitive verb, Inflected, kled.

Defination from the web:
darkle from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Etymology: back-formation from darkling. Date: 1800. 1 a : to become clouded or gloomy b : to grow dark. 2 : to become concealed in the dark ...