We found one dictionary that defines the word fall off the face of the earth:

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1. fall off the face of the earth: Idioms

▸ Words similar to fall off the face of the earth ▸ Usage examples for fall off the face of the earth ▸ Idioms related to fall off the face of the earth ▸ Wikipedia articles (New!) ▸ Words that often appear near fall off the face of the earth ▸ Rhymes of fall off the face of the earth ▸ Invented words related to fall off the face of the earth