懐く
なつく · natsuku · JLPT N1 · verb-godan
to become emotionally attached
🐶 懐 = heart radical 忄 + robe-fold 褱: a heart tucked into your bosom, which is why it means to bond
Classical 懐 (ふところ, bosom) is the inside of your robe, where something warm is held close. 懐く describes an animal or child that tucks itself into your trust and becomes attached.