fall through the floor

fall/go through the floor

if the price or value of something falls through the floor, it becomes very low House prices have gone through the floor this year.

Name	Pronounced	Usage
Ruchel	-	Yiddish
Quetzalcoatl	kwet-səl-KWAH-təl (English)	Aztec and Toltec Mythology
Mosi	-	Eastern African, Swahili
DuŠKo	-	Serbian, Croatian, Macedonian
Jiahao	-	Chinese
Elkan	-	Hebrew