The Collaborative International Dictionary of English v.0.48:

Keck \Keck\ (k[e^]k), v. i. [imp. & p. p. Kecked; p. pr. & vb.
   n. Kecking.] [Cf. dial. G. k["o]cken, k["o]ken.]
   To heave or to retch, as in an effort to vomit. [R.] --Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Keck \Keck\, n.
   An effort to vomit; queasiness. [R.]
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "keck":
   barf, be nauseated, be seasick, be sick, bring up, choke on,
   chuck up, disgorge, egest, feed the fish, feel disgust, gag, heave,
   heave the gorge, puke, regurgitate, reject, retch, sick up,
   sicken at, spew, throw up, upchuck, vomit