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Jyutping geoi1 on1 si1 ngai4
Pinyin jū ān sī wēi

Definitions (CC-CEDICT)
  1. to think of danger in times of safety
  2. to be vigilant in peacetime (idiom)
Definitions (粵典–words.hk)
  1. 動詞
    處​於​平安​嘅​環​境​都​要​預​想​將​來​有​咩​危​險
    to think of danger in times of safety; to be vigilant in peaceful times
    • 而家有幾個錢,應該居安思危,儲返啲錢傍身。
      而家有几个钱,应该居安思危,储返啲钱傍身。
      ji4 gaa1 jau5 gei2 go3 cin4, jing1 goi1 geoi1 on1 si1 ngai4, cou5 faan1 di1 cin2 pong4 san1.
      Although you are quite rich now, you should be vigilant and save some money.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to think of danger in times of safety; to be vigilant in peacetime
    (syn.) 处安思危, 處安思危
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    而家有几个钱,应该居安思危,储返啲钱傍身。
    而家有幾個錢,應該居安思危,儲返啲錢傍身。
    ji4 gaa1 jau5 gei2 go3 cin4, jing1 goi1 geoi1 on1 si1 ngai4, cou5 faan1 di1 cin2 pong4 san1.
    • Although you are quite rich now, you should be vigilant and save some money.
Examples (Wiktionary)
  1. Mandarin
    居安思危
    居安思危
    jū ān sī wēi
    • to think of danger in times of safety