四紅一白 [－红－－]

Jyutping sei3 hung2 jat1 baak6
Pinyin sì hóng yī bái

Definitions (粵典–words.hk)
  1. 名詞
    香港​嘅​消防局​處理​一級​火​嘅​時​候​，​一般​會​派出​嘅​車​輛​；​分別​係​泵車​、​升降台​車​、​雲梯車​同細​搶​救車​，​一共​四部​紅​色​嘅​消防​車​，​加​一部​白色​嘅​救​護​車​，​所以​叫​「​四紅​一白​」
    the fire brigade's typical response to a first-alarm fire in Hong Kong, literally "four red and one white"