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foot-in-mouth disease

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noun Informal: Facetious.
the habit of making inappropriate, insensitive, or imprudent statements.
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Origin of foot-in-mouth disease

1965–70; pun on foot-and-mouth disease, with allusion to foot-in-mouth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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