pipe up

British  

verb

1. to commence singing or playing a musical instrument

   the band piped up

2. to speak up, esp in a shrill voice

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pipe up Idioms  

1. Speak up, as in Finally she piped up, “I think I've got the winning ticket,” or Pipe up if you want more pancakes. This term originally referred to a high, piping tone. [Mid-1800s]

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Example Sentences

Frankly, if he wasn't piping up you'd be minded to check his pulse.

From BBC

Joe’s inner monologue pipes up, excitedly stating, “In the canon of epic romances, bouncing back from a gunpoint confessional is practically a genre staple.”

From Salon

Already, the leadership at Stanford University has piped up in support, with a similar vow to tell Trump to shove his authoritarian demands.

From Salon

His great aunt, who sat next to him, piped up that his parents had abandoned him and there was nobody to care for him.

From Los Angeles Times

The incidents prompted a week-long discussion about when piping up can be fun, and how it can quickly get out of hand.

From BBC