one word says it all (idiom, from Analects); to cut a long story short
in a nutshell
Definitions (粵典–words.hk)
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)
phrase, idiomatic
to summarize in a word; in a nutshell (syn.) 一言蔽之