What does "dle" mean?

Initialism of double-layer ejecta.

Dle

Common synonyms include: breach, data breach, digital learning platform, discoid lupus erythematosus, e learning environment, exposure.

noun, slang

noun, slang ·Moderate ·College level

Noun

1
Initialism of double-layer ejecta. abbreviation, alt-of, initialism
2
A short, daily web-based guessing game or puzzle, especially one of many played one after another. Internet, in-plural, informal, with-definite-article
3
a chronic skin disease occurring primarily in women between the ages of 20 and 40; characterized by an eruption of red lesions over the cheeks and bridge of the nose wordnet

Back-formation from Wordle (“web-based word game”), imitating the apparent suffix (taken from the surname of developer Josh Wardle).