1. small animals or insects that are harmful or annoying, especially those that are difficult to control
Usage: typically used as a plural noun
2. people regarded as unpleasant or harmful to society
Usage: derogatory; offensive

Examples

• The old barn was infested with rats and other vermin.
• Farmers use traps to control vermin that damage their crops.
• The exterminator was called to deal with the vermin problem.
• Cockroaches and mice are common household vermin.
• The abandoned building became a breeding ground for vermin.
• She set up poison bait to eliminate the vermin in her basement.