Here's one I've noticed only in the last, say, ten years or so, particularly in British sources, but now and then from the US as well, and that is, use of 'floor' for 'ground'; perhaps this usage goes 'way back ... ? To my mind, a 'floor' is inside a building, and 'the ground' is that flat surface in the great outdoors - so if you got out of your car and the cop/officer/constable pushed you down, you fell on the 'ground', not on the 'floor'.