What is the meaning of nestling?

noun

• Young bird not yet fledged.
  • synonyms: baby bird
• A young person of either sex.
  • usage: "she writes books for children"; "they're just kids"; "`tiddler' is a British term for youngster"
  • synonyms: child, kid, youngster, minor, shaver, nipper, small fry, tiddler, tike, tyke, fry

verb

• Move or arrange oneself in a comfortable and cozy position.
  • usage: "We cuddled against each other to keep warm"; "The children snuggled into their sleeping bags"
  • synonyms: cuddle, snuggle, nestle, nest, nuzzle, draw close
• Lie in a sheltered position.
  • usage: "The little cottage nestles in the forest"
  • synonyms: nestle
• Position comfortably.
  • usage: "The baby nestled her head in her mother's elbow"
  • synonyms: nestle, snuggle