Definition of "pipe up" [pipe up]

• To speak up, especially in a robust, assertive manner. (verb)
• To being singing or playing musical notes on a pipe or similar wind instrument. (verb)
• To begin to blow more vigorously. (verb)
• To call, awaken, or summon, as with a musical instrument. (verb)

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• "On March 16, a few days before he was to report to prison, Popcorn hooked a pipe up from the exhaust of his Ford Fairlane—his three-jug car, he called it, because he’d traded three jugs of liquor for it—and asphyxiated himself."
• "I suppose everybody has heard schoolboys quarrel, and noticed that just on the edge of a fight over a game of marbles one or the other would pipe up in a high-keyed tone, "You don't know who you're foolin 'with!""