An old piece of technology that barely works, usually having to be plugged into a power source constantly to function in the case of portable devices due to a faulty battery. Can also be applied to actual dinosaurs on life support (or at least humans or animals).
"This laptop is like a dinosaur on life support. I need to get it replaced."
"She's a dinosaur on life support."
"There is a dinosaur on life support in my backyard, and it's eating my cat."
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