The Collaborative International Dictionary of English v.0.48:

Cloy \Cloy\ (kloi), v. t. [imp. & p. p. Cloyed (kloid); p. pr.
   & vb. n. Cloying.] [OE. cloer to nail up, F. clouer, fr.
   OF. clo nail, F. clou, fr. L. clavus nail. Cf. 3d Clove.]
   1. To fill or choke up; to stop up; to clog. [Obs.]
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            The duke's purpose was to have cloyed the harbor by
            sinking ships, laden with stones.     --Speed.
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   2. To glut, or satisfy, as the appetite; to satiate; to fill
      to loathing; to surfeit.
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            [Who can] cloy the hungry edge of appetite
            By bare imagination of a feast?       --Shak.
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            He sometimes cloys his readers instead of
            satisfying.                           --Dryden.
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   3. To penetrate or pierce; to wound.
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            Which, with his cruel tusk, him deadly cloyed.
                                                  --Spenser.
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            He never shod horse but he cloyed him. --Bacon.
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   4. To spike, as a cannon. [Obs.] --Johnson.
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   5. To stroke with a claw. [Obs.] --Shak.
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WordNet (r) 3.0 (2006):

cloy
    v 1: supply or feed to surfeit [syn: surfeit, cloy]
    2: cause surfeit through excess though initially pleasing; "Too
       much spicy food cloyed his appetite" [syn: cloy, pall]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "cloy":
   allay, cram, engorge, fill, fill up, glut, gorge, jade, overdose,
   overfeed, overfill, overgorge, oversaturate, overstuff, pall, sate,
   satiate, satisfy, saturate, slake, stall, stodge, stuff,
   supersaturate, surfeit