noun
a sound or expression of contempt, disapproval, or disbelief
verb
to express disdain or disbelief towards something
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The expert pooh poohed the idea of using outdated technology for the project.
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Don't pooh pooh my suggestion without considering its benefits.
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Stop pooh poohing everything I say, give it a chance!
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She always pooh poohs any opportunity for personal growth.