Source : Webster's Revised Unabridged Dictionary (1913)

Squab \Squab\, adv. [Cf. dial. Sw. squapp, a word imitative of a
   splash, and E. squab fat, unfledged.]
   With a heavy fall; plump. [Vulgar]

         The eagle took the tortoise up into the air, and
         dropped him down, squab, upon a rock.    --L'Estrange.

Squab \Squab\, v. i.
   To fall plump; to strike at one dash, or with a heavy stroke.
   [Obs.]

Squab \Squab\, a. [Cf. dial. Sw. sqvabb a soft and fat body,
   sqvabba a fat woman, Icel. kvap jelly, jellylike things, and
   and E. quab.]
   1. Fat; thick; plump; bulky.

            Nor the squab daughter nor the wife were nice.
                                                  --Betterton.

   2. Unfledged; unfeathered; as, a squab pigeon. --King.

Squab \Squab\, n.
   1. (Zo["o]l.) A neatling of a pigeon or other similar bird,
      esp. when very fat and not fully fledged.

   2. A person of a short, fat figure.

            Gorgonious sits abdominous and wan, Like a fat squab
            upon a Chinese fan.                   --Cowper.

   3. A thickly stuffed cushion; especially, one used for the
      seat of a sofa, couch, or chair; also, a sofa.

            Punching the squab of chairs and sofas. --Dickens.

            On her large squab you find her spread. --Pope.

Source : WordNet®

squab
     adj : short and fat [syn: {squabby}]

squab
     n 1: flesh of a pigeon suitable for roasting or braising; flesh
          of a dove (young squab) may be broiled [syn: {dove}]
     2: a soft padded sofa
     3: an unfledged pigeon