[n. dee-koi, dih-koi; v. dih-koi]
a person who entices or lures another person or thing, as into danger, a trap, or the like.
anything used as a lure.
a trained bird or other animal used to entice game into a trap or within gunshot.
an artificial bird, as a painted wooden duck, used for the same purpose.
a pond into which wild fowl are lured for capture.
an object capable of reflecting radar waves, used as a spurious aircraft, missile, chaff, etc., for the deception of radar detectors.
verb (used with object)
to lure by or as if by a decoy: They decoyed the ducks to an area right in front of the blind.
verb (used without object)
to become decoyed: Ducks decoy more easily than most other waterfowl.

1610–20; variant of coy (now dial.) < Dutch (de) kooi (the) cage, Middle Dutch cōie < Latin cavea cage

decoyer, noun

2. enticement, bait, inducement, allurement. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  a person or thing used to beguile or lead someone into danger; lure
2.  military something designed to deceive an enemy or divert his attention
3.  a bird or animal, or an image of one, used to lure game into a trap or within shooting range
4.  an enclosed space or large trap, often with a wide funnelled entrance, into which game can be lured for capture
5.  (Canadian) another word for deke
6.  to lure or be lured by or as if by means of a decoy
7.  (Canadian) (tr) another word for deke
[C17: probably from Dutch de kooi, literally: the cage, from Latin caveacage]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1618, most likely from Du. kooi "cage," used of a pond surrounded by nets, into which wildfowl were lured for capture, from W.Gmc. *kaiwa, from L. cavea, "cage." The first element is possibly the Du. definite article de, mistaken in Eng. as part of the word. But decoy, of unknown origin, was the name
of a card game popular c.1550-1650, and this may have influenced the form of the word.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My experiences inside the hippo decoy were incredibly rewarding as a scientist, yet at times also extremely scary.
Decoy weapons are a time-honored military tradition.
So he towed a seal decoy made of carpet behind his boat, in order to attract a breaching shark.
The space-age design isn't some decoy, though, because the drops have some
  impressive pedigree under the hood.
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