Gamble
I'm putting all my shellfish on someone, hoping they'll win the race! This is a gamble and you're gambling.
Remember, shellfish used to be used as money. So if you're betting shellfish on someone, you're just gambling. And you probably won't get any of those shellfish back.
と
か
None
If you win this gamble you'll have enough shellfish to buy a brand new car (か)!
If you go to any of those fancy (and not so fancy) gamble-places, they always have a car sitting in the middle of the room. Usually rotating, really slowly, to make you want it more, making you gamble more.