shark bait

/ˈʃɑːkbeɪt/noun
RareNot in standard dictionaries
1

One who is in a precarious or vulnerable position.

2

One who has been, or is likely to be, attacked by a shark.

3

A lone swimmer or surfer far from shore.

4

Used other than figuratively or idiomatically: see shark, bait.

#colloquial