半大不小 [－－－－]

Jyutping bun3 daai6 bat1 siu2
Pinyin bàn dà bù xiǎo

Definitions (Wiktionary)
  1. phrase, idiomatic
    between childhood and adulthood
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）