Snug, Snuggle

The adjective snug, from the 1590s, referred to a ship that was seaworthy, that was compact and trim, especially a ship that was protected from the weather.  
 
The origins of snug are uncertain—perhaps from Old Norse snoggr (short-haired) or Old Danish snog (neat, tidy). The word snug may have its origins in Proto-Indo-European (PIE) kes-(1) (to scratch).
 
In a pub, a ‘snug’ is a small, cozy, intimate or private enclosed room or alcove away from hustle and bustle of the main area for eating and drinking. Snugs first appeared in pubs in the late 19th century.
 
Snug, meaning in a state of ease or comfort, is from the 1620s. The phrase “snug as a bug in a rug” is from 1769. Snug, meaning to fit closely, is first seen in 1838.
 
The verb ‘to snuggle’ (to move this way and that to something or someone, perhaps for warmth or affection) is from the 1680s. Snuggle, meaning to move so as to lie close to, is from the 1580s.
 
Reference: Online Etymological Dictionary, https://www.etymonline.com/
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