"Exponential."
"As a language teacher, I've seen and heard this abused as simple hyperbole. Unfortunately, this is not one of these times. When they say exponential, they mean it."
"I knew it was strange when the parents told the kids not to go home after we decided to cancel the camping trip. Especially when most of them caught a fever. And some suffered dangerous hypothermia. Did we catch some weird illness?"
"Overnight, hundreds of thousands of people died. And that was in Tokyo alone...