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Related to pipe up: pipe tobacco
pipe up (with something)
Fig. to interject a comment; to interrupt with a comment. Nick piped up with an interesting thought. You can always count on Alice to pipe up.
to speak unexpectedly â€œI want to be the first female president!â€ piped up one of the little girls.
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]
To join a conversation with an opinion, especially unexpectedly: You should have piped up if you didn't agree with us.