nuzzle up against (someone or something)
1. Of an animal, to rub its nose against someone or something in an affectionate manner. We were nervous about bringing the baby home, but when we did, our cat nuzzled up against the baby carrier right away.
2. To snuggle up against or rub softly against someone or something. When my daughter was a young girl, the only way she'd fall asleep was if she nuzzled up against her favorite teddy bear. I'm cold! Nuzzle up against me and warm me up, my love.
nuzzle up against someone or something
and nuzzle up (to someone or something)[for an animal] to rub its nose against someone or something; to rub against someone or something, softly, in the manner of rubbing the nose against someone or something; to snuggle up to someone or something. (Nuzzle is related to nose.) The dog nuzzled up against my leg, wanting to be friends. The dog nuzzled up to me and licked my hand.