To speak suddenly or sharply, as from surprise or emotion.
"I'm sorry," he managed to blurt out.
Players should not blurt out the rule before everyone has figured it out, as that would ruin the game for the other players.
blurt out the first words they thought of when I said fast.
They notice that he tends to just blurt out whatever comes into his head.
"I killed my sister!" he managed to blurt out.