小弟
しょ
う
て
い
Meanings
1
little brother; younger brother
Neutral term for one's own younger brother or a younger brother in general. Not commonly used in modern everyday speech; 弟 (おとうと) is the standard word.
He is my younger brother.
2
my younger brother (humble)
Humble form used when referring to one's own younger brother to someone outside the family. Archaic and very formal; 弟 (おとうと) is used in modern humble contexts.
My younger brother is in your care.
3
I; me (humble, male, used in letters)
humble (kenjougo)male term, language, or name
Humble first-person pronoun used by men, mainly in letters. Extremely formal and archaic; not used in modern conversation.
See also: 大兄
I have arrived safely.