1. A deep-sea fishing ground off the Shetland Islands.
Usage: chiefly Scottish and nautical; historical

Examples

• The fishermen set out for the haaf in their small boats.
• Haaf fishing was a major industry for Shetland communities in the 18th and 19th centuries.
• The haaf grounds were known for their abundant cod and ling.
• Shetland fishermen spent weeks on the haaf during the fishing season.