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Jyutping jat1 jin4 ji5 bai3 zi1
Pinyin yī yán yǐ bì zhī

Definitions (CC-CEDICT)
  1. one word says it all (idiom, from Analects); to cut a long story short
  2. in a nutshell
Definitions (粵典–words.hk)
  1. 語句
    用​一句​説​話​總​結​晒
    in one sentence
    • 一言以蔽之,呢個計劃嘅問題就係冇經費。
      一言以蔽之,呢个计划嘅问题就系冇经费。
      jat1 jin4 ji5 bai3 zi1, nei1 go3 gai3 waak6 ge3 man6 tai4 zau6 hai6 mou5 ging1 fai3.
      In short, the flaw of the project is a lack of funding.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to summarize in a word; in a nutshell
    (syn.) 一言蔽之
Examples (粵典–words.hk)
  1. Cantonese
    一言以蔽之,呢个计划嘅问题就系冇经费。
    一言以蔽之,呢個計劃嘅問題就係冇經費。
    jat1 jin4 ji5 bai3 zi1, nei1 go3 gai3 waak6 ge3 man6 tai4 zau6 hai6 mou5 ging1 fai3.
    • In short, the flaw of the project is a lack of funding.
  2. Cantonese
    一言以蔽之
    一言以蔽之
    jat1 jin4 ji5 bai3 zi1
    • using one line to cover all that