To incorrectly play a note by hitting a partial other than the one intended.(verb)
To defecate.(verb)
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Use "cack" in a sentence
"Several of the words used in Earl Sterndale are found in other dialects of the British Isles, such as cack-handed 'clumsy', chuntering 'mumbling disagreeably', and nous, 'common sense'."
"Is this some kind of cack-handed attempt to stem the Lib Dem advances in Henley-on-Thames?"
"If any one be carving awkwardly with the left wrist doubled under, the right arm angularly extended, and the knife sawing at a joint, our village miners and country Californians call it "cack -" or "cag-handed.""