go through the floor
US /ɡoʊ θruː ðə flɔr/
UK /ɡoʊ θruː ðə flɔr/
1.
to fall to a very low level; to decrease very quickly
:
•
Sales of the product went through the floor after the scandal.
•
House prices in the area have gone through the floor.
to fall to a very low level; to decrease very quickly