go through the floor

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

chuter, s'effondrer

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

:
Sales of the product went through the floor after the scandal.
Les ventes du produit ont chuté après le scandale.
House prices in the area have gone through the floor.
Les prix des maisons dans la région ont chuté.