different between darkle vs dartle

English

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.

From dart +? -le.

dartle (third-person singular simple present dartles, present participle dartling, simple past and past participle dartled)

To pierce or shoot through; to dart repeatedly.
- 1855, Robert Browning, My Star
  my star that dartles the red and the blue

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