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1. To summon or signal for someone or something by whistling with one's mouth. It drove me crazy the way he whistled for the waiter during our meal—it was just so rude and arrogant. Needless to say, I don't think we'll be going on a second date.
2. To expect something with no chance of ever getting it. Usually said as a sarcastic demand or instruction. If you want us to pay for your legal bills, well, you can just whistle for it.
whistle for someone or something
to summon someone or something by whistling. I stood on the corner and whistled for a cab, but they all ignored me. I whistled for the dog, but it did not appear.
Ask for or expect without any prospect of success, as in If you want a cash refund, you can just whistle for it. [Mid-1700s]
To summon someone or something by whistling: I whistled for my dog.