Shark Bait Meaning

(Australia, colloquial) A lone swimmer or surfer far from shore, a shark baiter.

Example: Used other than as an idiom: see shark,‎ bait.
1999, Pat Slater, Amazing Facts about Australia, page 48,
  The Australian Sea-lions at Seal Bay, Kangaroo lsland, had almost been wiped out by killing for shark bait when a conservation reserve was proclaimed in 1954.
2003, Jimmie Dean Coy, Valor: A Gathering of Eagles, page 126,
  I thought, “What a way to go. After all I′ve been through, I′m going to check out as a hunk of shark bait."
2006, Donald E. Biederman, et al., Law And Business of the Entertainment Industries, Fifth Edition, page 312,
  In “Great White” a local newsman and his cameraman, in order to obtain publicity, decide to lower raw meat off the pier as shark bait.
2001, Gordon Korman, Island, Book I: Shipwreck, page 118,
  When Ian informed Will that it was his turn for shark-bait position, he was told, “You know, Lyssa came in second in chess club, but she lost to Seth Birnbaum in the final.”
  By unspoken agreement, Luke, Ian, and Charla stopped asking Will to take his turn dangling in the ocean.