小弟

小弟 is a term used to refer to one's younger brother, typically in a familial or close relationship. It carries a tone of humility and familiarity, often used by the older sibling when speaking about themselves in relation to their younger brother.

The character 小 (xiǎo) means 'small' or 'young,' and 弟 (dì) means 'younger brother.' Together, they literally translate to 'young brother,' emphasizing the age difference and familial bond.

小弟 is commonly used in informal settings and among family members. It can also be used humorously or affectionately in some contexts. In formal writing, it may be replaced with more neutral terms like 弟弟 (dìdi), but in spoken Chinese, 小弟 is widely understood and used.