跡継ぎ
あとつぎ · atotsugi · JLPT N1 · noun
heir
👑 跡 (trail left behind) + 継ぐ (inherit) = one who inherits the trail
跡 means a trace or what is left behind, and 継ぐ means to succeed or inherit. Together they name the person who takes over what someone else leaves behind, such as a family business or title.