noun
- a small rodent with a long tail, typically larger than a mouse
- a person who betrays or informs on others
Usage: informal
verb
- to inform on someone; to betray
- to hunt or catch rats
Usage: informal
Examples
- The old barn was infested with rats.
- She set traps to catch the rats in her basement.
- Don't trust him – he's a rat who will sell you out.
- The prisoner ratted on his cellmate to get a lighter sentence.
- The terrier was bred for ratting in warehouses.
- Rats are intelligent animals that can learn complex tasks.