Meaning

noun a close and affectionate (and often prolonged) embrace

verb move or arrange oneself in a comfortable and cozy position

verb lie in a sheltered position

originFrom Middle English nestelen, nestlen, from Old English nistlan, nestlian, nistlian (“to make or build a nest”), from Proto-West Germanic *nistilōn (“to build or occupy a nest; nestle”), equivalent to nest + -le. Cognate with Middle Low German nëstelen (“to build a nest”), Dutch nestelen (“to nest, nestle”).

Etymology from Wiktionary, CC BY-SA 3.0