= to start talking suddenly, to interrupt, to speak after a period of being silent
"I asked the class a question and everyone was silent for a moment before Anna piped up and gave me the answer."
This quote from theage.au.com "My kids spent the sober, rainy days that followed the horrific Paris attacks with their grandparents, playing Monopoly. So it was somewhat gingerly that I introduced the subject later, asking what they had heard, and knew. "Not much", they responded, both walking into the kitchen and shrugging nonchalantly. A couple of minutes later my nine-year-old piped up: "Well I did read the newspaper and find out some stuff."
"Like what?" With an alarming level of detail, she quickly outlined the number of people who had died and how, the carnage inside Bataclan concert hall, the reaction of the rock band on stage, and the bombs outside the stadium. She then asked if she could see footage of the shooting: I refused." http://www.theage.com.au/comment/how-to-talk-to-kids-about-terror-20151119-gl38qw.html More info at teacherluke.co.uk