Meaning of “the earth/ground/floor opens” in the English Dictionary

british dictionary

"the earth/ground/floor opens" in British English

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the earth/ground/floor opens

You say that you wish the earth/floor/ground would open (up) if you are so embarrassed that you want suddenly to disappear:

At that moment the boss walked in, and I just wanted the ground to open up and swallow me.

(Definition of “the earth/ground/floor opens” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)