also: がたおち
noun, noun or participle which takes 'suru', intransitive verb
Colloquial term for a sudden, steep decline in value, amount, quality, or reputation. Often used with する to mean 'to plummet'.
株価がガタ落ちした。
The stock price plummeted.
彼の評判はガタ落
His reputation has taken a nosedive.