Etymology
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kale (n.)

also kail, "cabbage, any kind of greens with curled or wrinkled leaves," c. 1300, a variant of cawul (see cole (n.1)), surviving in Scottish and northern English. Slang meaning "money" is from 1902, from the notion of leaves of green.

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Definitions of kale

kale (n.)
informal terms for money;
Synonyms: boodle / bread / cabbage / clams / dinero / dough / gelt / lettuce / lolly / lucre / loot / moolah / pelf / scratch / shekels / simoleons / sugar / wampum
kale (n.)
a hardy cabbage with coarse curly leaves that do not form a head;
Synonyms: kail / cole / borecole / colewort / Brassica oleracea acephala
kale (n.)
coarse curly-leafed cabbage;
Synonyms: kail / cole
From wordnet.princeton.edu