cuddle (v.)

"hug, embrace so as to keep warm; lie close or snug," 1520s (implied in cudlyng), of uncertain origin. OED calls it "A dialectal or nursery word." Perhaps a variant or frequentative form of obsolete cull, coll "to embrace" (see collar (n.)); or perhaps from Middle English *couthelen, from couth "known," hence "comfortable with." It has a spotty early history and seems to have been a nursery word at first. Related: Cuddled; cuddling. As a noun, "a hug, an embrace," by 1825.

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Definitions of cuddle from WordNet
cuddle (v.)
move or arrange oneself in a comfortable and cozy position;
We cuddled against each other to keep warm
Synonyms: snuggle / nestle / nest / nuzzle / draw close
cuddle (v.)
hold (a person or thing) close, as for affection, comfort, or warmth;
I cuddled the baby
cuddle (n.)
a close and affectionate (and often prolonged) embrace;
Synonyms: nestle / snuggle