情ㄑㄧㄥˊqíng同ㄊㄨㄥˊtóng手ㄕㄡˇshǒu足ㄗㄨˊzú

  1. 情感如親兄弟般的深厚。《封神演義·第四十一回》：「名雖各姓，情同手足。」也作「情若手足」。似親如手足、情同骨肉

英as close as one's hands and feet (idiom)​; loving one another as brothers, deep friendship, closely attached to one another
德einander wie Brüder sein (Adj)​