プログレッシブ和英中辞典(第4版)の解説
なつく【懐く】
take to ((a person))
男の子たちは新しい先生にすぐ懐いた
The boys soon took [became attached] to the new teacher.
子供たちは皆彼女に懐いていた
All the children were attached to her.
その犬はなかなか懐かなかった
It took a long time for me to win the dog over.／The dog didn't take to me easily.