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jump the shark
1. In television programming, to resort to using an obvious or unbelievable gimmick in a scene, episode, or storyline as a means of maintaining viewership, especially when the show's quality and/or popularity has begun to decline. The phrase alludes to the sitcom Happy Days, in which the character Fonzie (Henry Winkler) jumps over a shark on water-skis in the fifth season. This show used to have some of the wittiest writing in television, but they really jumped the shark when they introduced a contrived alien invasion in the seventh season.
2. By extension, to signal, especially through a conspicuous activity, event, or maneuver, a decline in the progress or evolution of something (e.g., a company, a brand, a political endeavor, etc.). The global tech giant, whose smartphone brand transformed the everyday technological landscape, seems to have jumped the shark this week when they revealed a line of computer-synced sneakers touted as their new flagship product. The governor was accused of jumping the shark during his re-election campaign by joining in with the cheerleading squad at his former high school's football game.
1. slang A person swimming or surfing alone in the ocean. We sat on the beach with our drinks, watching the foolish shark bait going into the water alone for an evening swim.
2. (Hawaii slang) A very pale beachgoer, especially a tourist. (Supposedly because pale skin is attractive to sharks.) We don't hang out in this part of town too often in the summer, as it gets overwhelmed with shark bait this time of year.
3. A particularly naïve or gullible person who is an ideal target for a scam, graft, or con. He'd been in the game of scamming people for so long that he could spot shark bait from a mile away. Don't you dare wear that fanny pack out in town. We'll look like shark bait to the locals!
wouldn't shout if a shark bit him
Cheap, miserly. In Australia, "to shout" is to buy someone something, usually a drink. Primarily heard in Australia. You expect Steve to buy you a drink? Ha! That guy wouldn't shout if a shark bit him!
1. n. a swindler; a confidence operator. (Underworld.) The sharks were lined up ten deep to get at the blue-eyed new owner of the bowling alley.
2. n. a lawyer. (Derogatory.) Some shark is trying to squeeze a few grand out of me.
n. something that prevents corporate takeovers. (Securities markets.) Acme Systems tried again to get its board to approve a shark repellent to keep the Widget cartel from acquiring it.
See also: shark
jump the shark
To undergo a sustained decline in quality or popularity.