snug / snəg/ • adj. (snug·ger, snug·gest) 1. comfortable, warm, and cozy; well protected from the weather or cold: she was safe and snug in Ruth's arms a snug cottage. ∎ archaic (of an income or employment) allowing one to live in comfort and comparative ease.2. (esp. of clothing) very tight or close-fitting: a well-shaped hood for a snug fit.• v. [tr.] place (something) safely or cozily: she tucks him in, snugging the blanket up to his chin. ∎  [intr.] settle comfortably and cozily: the passengers snugged down among the cargo.PHRASES: snug as a bug (in a rug) humorous in an extremely comfortable position or situation.DERIVATIVES: snug·ly adv.snug·ness n.

snug (of a ship) trim, secure against bad weather XVI; in ease or comfort XVII. First in naut. use and prob. of LG. or Du. orig. (cf. LG. snögger slim, smart, Du. †snuggher, †snoggher (mod. snugger) clever, smart).
Hence (see -LE2) snuggle lie snug or close. XVII.