(pos:名詞)
<explanation>
yue:對於自己唔識嘅細路仔嘅稱呼（量詞：個）
eng:a term of address used for little boys that you do not know
<eg>
yue:嗰度有個弟弟喺度喊呀，你去睇下咩事吖？ (go2 dou6 jau5 go3 di4 di2 hai2 dou6 haam3 aa3, nei5 heoi3 tai2 haa5 me1 si6 aa1?)
eng:There's a boy crying over there, can you go and find out why?

(pos:名詞)(sim:細佬)
<explanation>
yue:同一對阿爸阿媽生，年紀比自己細嘅男性；有時同父異母，或者同母異父，或者同一個監護人，亦可以稱為弟弟（量詞：個）
eng:younger brother
<eg>
yue:我弟弟成個隱青咁，我真係好擔心。 (ngo5 dai4 dai2 seng4 go3 jan2 cing1 gam2, ngo5 zan1 hai6 hou2 daam1 sam1.)
eng:My younger brother is a Hikikomori. I'm worried about him.

(pos:名詞)(label:書面語)(sim:細佬)
yue:「弟弟」（細佬）嘅書面語讀法
eng:the pronunciation of 弟弟 "younger brother" in written Chinese