noun
a tube or channel for conveying fluids or gases
verb
to speak up or speak loudly and assertively
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During the meeting, I kindly asked everyone to pipe up if they had any concerns.
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Hey, don't be shy, just pipe up and let us know what you think.
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Yo, if you got something to say, just pipe up and speak your mind.
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It's important to pipe up and stand up for what you believe in, even if it's not popular.