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plural ackers
(dialectal, now rare) A visible current in a lake or river; a ripple on the surface of water. quotations
The wide lovely lake lay in dreamy serenity, fretted with green undulations, ruffed with blue, patched with glades of lucid smoothness between the ackers [...].
1969, Vladimir Nabokov, Ada or Ardor, Penguin, published 2011, page 436
Obsolete form of acre. examples