Also called borecole. a cabbagelike cultivated plant, Brassica oleracea acephala, of the mustard family, having curled or wrinkled leaves: used as a vegetable.
Scot. cabbage.
Slang. money.
Also, kail.

1250–1300; Middle English cale, northern variant of cole

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World English Dictionary
kale or kail1 (keɪl)
1.  See also collard a cultivated variety of cabbage, Brassica oleracea acephala, with crinkled leaves: used as a potherb
2.  (Scot) a cabbage
3.  slang (US) money
[Old English cāl; see cole]
kail or kail1
[Old English cāl; see cole]

kale2 (keɪl)
dialect (Northern English) a queue

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, M.E. cawul, surviving as a Scottish variant of cole "cabbage" (see cole-slaw). Slang meaning "money" is from 1902.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The office gym has personal trainers and flyers with recipes for kale and
  quinoa salad.
Typically, cabbage or kale is simply wilted with a little garlic and oil and
  served on the side.
Remove and discard the stems from the kale and spinach.
The addition of chocolate adds a surprising sweet twist to this protein-packed
  bowl of pinto beans and kale.
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