shark bait

cut bait

To give up on something in order to pursue something else.

fish or cut bait

To make a decision, especially after a period of delay; to either take action now or forgo the opportunity.

jump the shark

Of television program or other narrative, to undergo a storyline development which heralds a fundamental and generally disappointing change in direction.

wouldn't shout if a shark bit him

To be frugal or miserly.