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definitions

misspeak

[mis-speek]
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verb (used with or without object), mis·spoke, mis·spok·en, mis·speak·ing.

to speak, utter, or pronounce incorrectly.
to speak inaccurately, inappropriately, or too hastily.

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How much talking does your body do?
The phrase “body language” or nonverbal communication often gets tossed around. From public speaking to a first date, our movements and facial expressions say a lot about our feelings and intentions. Now, as we enter into political debate season, politicians’ body language will be under just as much scrutiny as their remarks, and if the candidates aren’t careful, they might misspeak without saying a word. …
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RELATED WORDS

miscue, lapse, recklessness, error, gaffe, misjudgment, mislead, promote, misrepresent, deceive, goof, folly, imprudence, foolishness, thoughtlessness, hastiness, stupidity, slip, stumble, rashness

Origin of misspeak

1150–1200; Middle English misspeken; see mis-1, speak; compare Old English missprecan to murmur
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin and History for misspeak
v.

late 14c., "to say amiss," also "to speak insultingly," from mis- (1) + speak. Related: Misspeaking; misspoken. Old English missprecan meant "to grumble, murmur."

Online Etymology Dictionary, © 2010 Douglas Harper