vent hole
/ˈvɛnt ˌhoʊl/
noun
- A small opening or hole that allows air, gas, or liquid to pass through, often in a machine, container, or structure.
- Bees use the small vent-hole in the hive to regulate temperature.
- The vent-hole in the fuel tank prevents a vacuum from forming.
- He drilled a vent-hole in the lid of the jar to let steam escape.