Definitions for pipe up
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Princeton's WordNet
pipe up(verb)
begin to play or sing
shriek, shrill, pipe up, pipe(verb)
utter a shrill cry
Wiktionary
pipe up(Verb)
To speak up, especially in a robust, assertive manner.
pipe up(Verb)
To being singing or playing musical notes on a pipe or similar wind instrument.
pipe up(Verb)
To begin to blow more vigorously.
pipe up(Verb)
To call, awaken, or summon, as with a musical instrument.
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"pipe up." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/pipe up>.