Other forms: perished; perishing; perishes
To perish means to die. Your brother's goldfish might perish if he forgets to feed it — so be sure to remind him that Goldie needs her dinner!
Perish comes from a Latin verb that means "to pass away." Many passengers on the Titanic perished after the ship hit an iceberg. Perish can also be used figuratively, as when an op-ed argues that the idea of the American Dream perished in the 21st century. People also sometimes use this word simply to be dramatic. You might, for instance, tell your mom that you'll perish if you aren't allowed to spend the weekend at your best friend's house.