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know whereof one speaks
(redirected from whereof)

Also found in: Dictionary/thesaurus

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know whereof one speaks

to know well the subject that one is speaking about. You are wrong! You do not know whereof you speak. He simply doesn't know whereof he speaks.

See also: know, one, speak

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Where there's muck, there's brass
where there's smoke, there's fire
Where will I find you?
Where you been keeping yourself?
Where's the beef?
Where's the fire?
wherefore
whereof
wherewithal
whet appetite
which brings me to the point
which way the wind is blowing
whiff of
while a period of time away
while away

Idioms and phrases

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