Talking about family quirks, Anne came up with another interesting phrase. She says her sister from Wisconsin says "a horse a piece" meaning "either way". So it would be the equivalent of "six of one, half dozen of the other". The first long explanation I saw for this was at Everything Summer Camp . It comes from a situation in a game where a player is trying to win a best-of-three match and each player has one win, so "one win apiece" eases into "a horse apiece". This feels most likely to me. I can see a link back to a friendly (or not so friendly) game of bar dice where, in the final best-of-three showdown, if you lose the first game, it's "a horse against you" or "a horse on you", after which, if the other player wins the second game, you would clearly have "a horse apiece." A lot of gambling games have the tokens or stakes nicknamed "horses". There's a bit of a time shift going...
A blog of word lore and word-based games.