孤燕不成夏 [－－－－－]

Jyutping gu1 jin3 bat1 sing4 haa6
Pinyin gū yàn bù chéng xià

Definitions (Wiktionary)
  1. phrase, idiomatic
    one swallow does not a summer make
    (syn.) 獨燕不成夏, 一燕不成夏, 独燕不成夏