Snug, a. [Compar. Snugger; superl. Snuggest.]
Etymology: [Prov. E. snug tight, handsome; cf. Icel. snöggr smooth, ODan. snög 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.
3 other Webster entries under this spelling
Snug, n. (Mach.)
Same as Lug, n., 3.
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.
Snug, v. t.
1. To place snugly. [R.] Goldsmith.
2. To rub, as twine or rope, so as to make it smooth and improve the finish.
Shades of meaning
Fernald has no entry of its own for snug; he lists it under comfortable.
He lists it without comment; the entries above explain its neighbors.