new disciple; new student; new apprentice
General term for a newly accepted follower or trainee in traditional arts, crafts, or disciplines.
newly accepted professional wrestler (sumo)
Specifically used in sumo for a newly recruited wrestler who has just joined a stable.
He entered as a new disciple of flower arrangement this year.
The new wrestler stepped onto the ring for the first time.
sumo recruit physical exam
Compound of 新 (new) and 弟子 (disciple, apprentice). The reading しんでし follows standard on'yomi for 新 and kun'yomi for 弟子.