From Longman Dictionary of Contemporary Englishwould/could kill for somethingwould/could kill for something (also would kill to do something) to want something so much that you will do almost anything to get it or do it I could kill for a smoke right now. In those days, actors would kill to break into film. → kill
Examples from the Corpus
would/could kill for something• But Katrinka is sustained by her search for her long-lost son, and a wardrobe a Vegas showgirl could kill for.• I could kill for him, easily and without thought.• Some of the lasses would kill for tab-ends and that.• Most retailers would kill for that kind of performance. 