The Collaborative International Dictionary of English v.0.48:

Bloat \Bloat\ (bl[=o]t), v. t. [imp. & p. p. Bloated; p. pr. &
   vb. n. Bloating.] [Cf. Icel. blotna to become soft, blautr
   soft, wet, Sw. bl["o]t soft, bl["o]ta to soak; akin to G.
   bloss bare, and AS. ble['a]t wretched; or perh. fr. root of
   Eng. 5th blow. Cf. Blote.]
   1. To make turgid, as with water or air; to cause a swelling
      of the surface of, from effusion of serum in the cellular
      tissue, producing a morbid enlargement, often accompanied
      with softness.
      [1913 Webster]

   2. To inflate; to puff up; to make vain. --Dryden.
      [1913 Webster]