go through the floor

US /ɡoʊ θruː ðə flɔr/
UK /ɡoʊ θruː ðə flɔr/
"go through the floor" picture
1.

激減する, 暴落する

to fall to a very low level; to decrease very quickly

:
Sales of the product went through the floor after the scandal.
スキャンダルの後、その製品の売上は激減した
House prices in the area have gone through the floor.
その地域の住宅価格は暴落した