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Jyutping sai3 zoi6 bit1 haang4
Pinyin shì zài bì xíng

Definitions (粵典–words.hk)
  1. 語句
    形勢​所​使​,​非​做​不可
    to be imperative under the circumstances

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Jyutping sai3 zoi6 bit1 hang4
Pinyin shì zài bì xíng

Definitions (CC-CEDICT)
  1. circumstances require action (idiom); absolutely necessary
  2. imperative
Definitions (Wiktionary)
  1. phrase, idiomatic
    to be imperative or necessary under such circumstances
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)