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This seems to be a variation of the idiom "to put one's foot in one's mouth". If you put your foot in your mouth, it means you have said something awkward or embarrassing. If someone says "open your mouth, it's time to switch feet" they probably are referring to the fact that you had already said one embarrassing or awkward thing and have just done it again(or are about to do it again).

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14y ago

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