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Webster 1913 Edition

Verb.

[Cf.

Verb.

To checker; to diversify.

[R. & Poet.]

The painted windows,

frecking

gloom with glow.

Lowell.

freck ‎(third-person singular simple present frecks, present participle frecking, simple past and past participle frecked)

(transitive, rare, poetic) To checker; to diversify.
The painted windows, frecking gloom with glow. — Lowell.