to have something in reserve but ready for use; to have a chance or opportunity remaining—nautical, USA, 1789—‘shot’: a projectile designed for discharge from a firearm—‘locker’: the compartment for keeping ammunition on a ship
very stupid—popularised by Jethro Tull’s ‘Thick as a Brick’ (1972), but already existed—in early use (19th century) applied to nouns such as ‘skull’ and ‘head’, used metonymically for ‘intelligence’
USA, 1815—not completely well; slightly ill or depressed—the image is of a ship caught in a storm (the noun ‘weather’ has long been used to denote a storm)
USA, late 19th century—to give up, to retire, also, occasionally, to die—from the image of a billiard-player putting the cue back in the rack when the game is over
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
humorous variant of ‘one man’s meat is another man’s poison’—Australia, 1872—used in particular of the opposition between flesh-eating and fish-eating in relation to the religious observance of fasting
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