一jat1落lok6千cin1丈zoeng6

English

1. lit. to drop a thousand zhang in one fall (idiom)
2. to suffer from a drastic decline; literally "to drop a thousand in one fall"
3. fig. (of business, popularity etc) to suffer a sudden, devastating decline
4. to take a dive

粵語 — Cantonese

1. 好短時間內就差咗好多

Examples

• 沙士期間，食肆生意一落千丈。

  During the breakout of SARS, restaurants earned a lot less.