Uchi-deshi

Uchi-deshi (Kanji: 内弟子 Hiragana: うちでし lit. "inside student") is a Japanese term for a live-in student/apprentice who trains under and assists a sensei on a full-time basis. The system exists in kabuki, rakugo, shogi, igo, aikido, sumo, karate and other modern Japanese martial arts.