bottom drops out en · X
Meanings
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Synonym of bottom falls out (“something fails or collapses”).
"You and I are not wanted here, Inspector," he whispered. "The bottom's dropped out of the case," and they slipped away together.
1923, Ernest Bramah [pseudonym; Ernest Brammah Smith], “(please specify the page)”, in The Eyes of Max Carrados, London: Grant Richards, →OCLC: