Source : Webster's Revised Unabridged Dictionary (1913)

Snug \Snug\, a. [Compar. {Snugger}; superl. {Snuggest}.] [Prov.
   E. snug tight, handsome; cf. Icel. sn["o]ggr smooth, ODan.
   sn["o]g neat, Sw. snugg.]
   1. Close and warm; as, an infant lies snug.

   2. Close; concealed; not exposed to notice.

            Lie snug, and hear what critics say.  --Swift.

   3. Compact, convenient, and comfortable; as, a snug farm,
      house, or property.

Source : WordNet®

snug
     adj 1: offering safety; well protected or concealed; "a snug
            harbor"; "a snug hideout"
     2: fitting closely but comfortably; "a close fit" [syn: {close},
         {close-fitting}]
     3: well and tightly constructed; "a snug house"; "a snug little
        sailboat"
     4: enjoying or affording comforting warmth and shelter
        especially in a small space; "a cozy nook near the fire";
        "snug in bed"; "a snug little apartment" [syn: {cozy}, {cosy}]
     [also: {snugging}, {snugged}, {snuggest}, {snugger}]

snug
     n : a small secluded room [syn: {cubby}, {cubbyhole}, {snuggery}]
     [also: {snugging}, {snugged}, {snuggest}, {snugger}]

snuggest
     See {snug}