The Collaborative International Dictionary of English v.0.48:

Snug \Snug\, n. (Mach.)
   Same as Lug, n., 3.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snug \Snug\, v. i. [imp. & p. p. Snugged; p. pr. & vb. n.
   Snugging.]
   To lie close; to snuggle; to snudge; -- often with up, or
   together; as, a child snugs up to its mother.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snug \Snug\, v. t.
   1. To place snugly. [R.] --Goldsmith.
      [1913 Webster]

   2. To rub, as twine or rope, so as to make it smooth and
      improve the finish.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   2. Close; concealed; not exposed to notice.
      [1913 Webster]

            Lie snug, and hear what critics say.  --Swift.
      [1913 Webster]

   3. Compact, convenient, and comfortable; as, a snug farm,
      house, or property.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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,
       snug, 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, snug]
    n 1: a small secluded room [syn: cubby, cubbyhole,
         snuggery, snug]

Moby Thesaurus II by Grady Ward, 1.0:

143 Moby Thesaurus words for "snug":
   airtight, airworthy, anal, autistic, bashful, bold, brief, brusque,
   burrow, casual, cheerful, chipper, close, close-tongued,
   closemouthed, comfortable, comfy, commodious, compact, concise,
   contented, convenient, cosy, cozy, croodle, cuddle, curt,
   cushioned, cushiony, cushy, dinky, dissociable, dumb, dustproof,
   dusttight, easeful, easy, economical of words, fast, firm,
   fit for sea, friendly, gasproof, gastight, hermetic,
   hermetically sealed, homelike, homely, homey, homish, incompatible,
   indisposed to talk, insociable, intimate, laconic, lightproof,
   lighttight, lived-in, luxurious, mopey, mopish, morose, mum, mute,
   neat, nestle, nongregarious, nuzzle, oilproof, oiltight, orderly,
   peaceful, plain, quiet, rainproof, raintight, relaxing, reposeful,
   restful, roomy, sea-kindly, sealed, seaworthy, self-contained,
   self-sufficient, sheltered, shipshape, short, shut fast, silent,
   simple, sleek, slick, smart, smokeproof, smoketight, snug down,
   snug up, socially incompatible, soft, sparing of words, speechless,
   spick-and-span, spruce, staunch, stiff, stormproof, stormtight,
   sullen, taciturn, tender, terse, tidy, tight, tight-lipped,
   tongue-tied, trig, trim, tuck in, unclubbable, uncluttered,
   uncommunicative, uncompanionable, uncongenial, unfriendly,
   ungenial, unloquacious, unpretending, unsociable, unsocial,
   untalkative, warm, water-repellant, waterproof, watertight,
   weatherly, well-cared-for, well-groomed, well-to-do, windproof,
   windtight, word-bound, wordless