兄弟子
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Meanings
1
senior pupil; senior disciple; senior student
Refers to a more experienced student under the same teacher or master, often in traditional arts, martial arts, or apprenticeship contexts. Contrasts with 弟弟子 (おとうとでし, junior pupil).
See also: 弟弟子
He is my senior disciple, having become a pupil of the same master ten years before me.
As a senior student, I am responsible for guiding the juniors.