different between dargle vs darkle

English

From the River Dargle, a popular spot for such trips.

dargle (plural dargles)

(Ireland, dated, Dublin) a day excursion, a picnic out of the city
- Early 1900s, Traditional, Waxies' Dargle (song)
  Says my aul' one to your aul' one "Will ye come to the Waxies' dargle?"

Back-formation from darkling.

darkle (third-person singular simple present darkles, present participle darkling, simple past and past participle darkled)

To be dark; to be visible only darkly.
- 1819, Lord Byron, Don Juan, II.49:
  Thus to their hopeless eyes the night was shown, / And grimly darkled o'er the faces pale [...].
To become dark; to show indistinctly.

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