1. A tunnel dug beneath a body of water, especially the Channel Tunnel between England and France.
Usage: informal; often capitalized when referring to the specific Channel Tunnel

Examples

• The Chunnel connects England and France beneath the English Channel.
• Passengers can take the Eurostar train through the Chunnel.
• The Chunnel was completed in 1994 after years of construction.
• Many travelers prefer the Chunnel to ferry crossings.
• The Chunnel is one of the longest undersea tunnels in the world.