Australia, 1946—an imaginary nerve that reacts whenever demands are made on one’s money, especially in the context of government proposals to increase taxes—first used, if not coined, by Ben Chifley, Prime Minister of Australia (1945-49)
Australia, 1938—an indignant response to someone who is taking the speaker for a fool—alludes to the condescending way in which townspeople treated people from the country during bush week (i.e., a festival held in a town or city, celebrating bush produce, activities, etc.)
the targeting of a potentially controversial message to specific voters while avoiding offending those voters with whom the message will not be popular—Canada, 1995—the image is that, like the sound made by a dog whistle, the message is only fully audible to those at whom it is directly aimed
UK politics, 1962—to delay dealing with something, in the hope that it will be forgotten—from the image of sending a ball into the tall grass off the playing field during a sporting event, which interrupts this event
UK, 1879—when matters become difficult or serious—of obscure origin—perhaps originally in reference to a music-hall song of that title, interpreted from 1870 onwards by Annie Adams
early 1930s—in an anti-climactic, disappointing way (used of something that comes to an end)—alludes to the last line of The Hollow Men (1925), by T. S. Eliot
UK, 1810—tenacious, persistent, obstinate—unwilling to yield, to relent or to let go—unable to set aside a preoccupation or obsession—the image is that a dog with a bone will not let go of that bone, no matter what