cuddle up
To snuggle with someone or something. I left the room in disgust when my sister and her boyfriend started cuddling up to each other. The puppies cuddled up to their mother.
cuddle up
(to someone or something) and cuddle up (with someone) to nestle or snuggle close to someone or something to get warm or to be intimate. Let's cuddle up to the warmth, near the fireplace. She cuddled up with him and went to sleep.
cuddle up
(with someone) Go to cuddle up (to someone or something).