Meaning of “blow/hang the expense” in the English Dictionary

british dictionary

"blow/hang the expense" in British English

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blow/hang the expense

UK informal

used for saying that you want something so much that you do not care how much it costs:

I'm going to book a holiday. Blow the expense!

(Definition of “blow/hang the expense” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)