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davy

davy2 slang.
  (ˈdeɪvɪ)
  A vulgar shortening of affidavit, esp. in phr. to take one's davy (= ‘to take one's oath’).

1764 O'Hara Midas ii. iv. (Farmer), And I with my davy will back it, I'll swear. 1785 Grose Dict. Vulgar Tongue, I'll take my davy of it. 1871 M. Collins Mrq. & Merch. I. vi. 210 [They] take their solemn oath and davy that they didn't do it.

Oxford English Dictionary

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