Borrowed from Japanese 弟子 (deshi, “disciple, pupil”).

deshi (plural deshis or deshi)

(sumo) a member of a heya ("stable"); trained by its shisho
disciple, mentee, follower
- 1917, James S. Benneville, The Yotsuya Kwaidan‎, Reprint edition, The Gutenberg Project, published 2006:
  At eight years of age Kichitaro[u] was placed as disciple (_deshi_) at the Jo[u]shinji of Fukagawa.
- 2008 September 8, Richard Halloran, “Japan’s rapid succession of prime ministers belies its global role”, in Taipei Times‎, Taipai, page 9:
  After him came several deshi, or followers he had mentored.

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