毁于一旦

Traditional form:

毀於一旦

Pinyin (reading):

huǐyúyīdàn

Definitions:

• (idiom) ruined in a short time (esp. of sth that took a long time or great effort to achieve)

Characters:

• 毁 - to damage, to ruin; to defame, to slander
• 于 - at, in, on; to, from; alas!
• 一 - one; a, an; alone
• 旦 - dawn; morning; day

Traditional characters:

• 毀 - to damage, to ruin; to defame, to slander
• 於 - at, in, on; to, from; alas!
• 一 - one; a, an; alone
• 旦 - dawn; morning; day