Chinese · Titles & Forms of Address
弟弟
dìdi
Also written: didi; di di; younger brother
A Mandarin kinship and reference term for a younger brother or a younger male of the same generation; it may also be used socially for a younger man.
Literal meaning
younger brother
Cultural context
Dìdi establishes the other person as younger and can express affection, protectiveness, seniority, teasing, or condescension depending on tone and relationship.
How dramas use it
Older characters may call a younger male dìdi in family, friendship, neighborhood, workplace, or romantic-age-gap contexts. The term can frame him as someone to protect—or someone not yet taken seriously.
Usage & formality
The second syllable is usually neutral in ordinary speech. Social use does not necessarily mean literal kinship, and tone determines whether it feels warm or patronizing.