The Collaborative International Dictionary
Haaf
Haaf \Haaf\ (h[aum]f), n. [Of Scand. origin; cf. Icel. & Sw. haf the sea, Dan. hav, perh. akin to E. haven.] The deep-sea fishing for cod, ling, and tusk, off the Shetland Isles.
Wiktionary
haaf
n. 1 (context Shetland Islands Scotland English) The open sea, especially as a place to fish. 2 (context Shetland Islands English) The practice of sea fishing for such as cod, ling and tusk.