snuggle v.

1590s, "compact, trim" (of a ship), especially "protected from the weather," perhaps from a Scandinavian source such as Old Norse snoggr "short-haired," Old Swedish snygg, Old Danish snøg "neat, tidy." This is perhaps ultimately from PIE *kes- (1) "to scratch" (see xyster).

The sense of "in a state of ease or comfort" is recorded by 1620s. The meaning "fit closely" is by 1838. Expression snug as a bug in a rug is attested by 1769; earlier was snug as a bee in a box (1706).

derivational suffix, also -le, used mostly with verbs but originally also with nouns, "often denoting diminutive, repetitive, or intensive actions or events" [The Middle English Compendium], from Old English. Compare brastlian alongside berstan (see burst); nestlian (see nestle) alongside nistan). It is likely also in wrestle, trample, draggle, struggle, twinkle, also noddle "to make frequent nods" (1733). New formations in Middle English might be native formations (jostle from joust) with this or borrowings from Dutch.