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Related to pipe up: pipe tobacco
To make oneself heard; to interrupt or interject. The meeting was just about over when Tom piped up and asked why we hadn't looked at the budget. What's the matter? Well, pipe up!
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.
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.