buttermilk

n [U] liquid that remains after butter has been separated from milk 脱脂乳.

bustle, bustling, busty, busy, busy oneself in, busybody, but, but for, butane, butch, butcher, butcher's shop, butchery, butler, butt, butter, butter-bean, butter-fingers, buttercup, butterfly, butterscotch, buttery, buttock, button, button mushroom, button up, button-down, buttoned up, buttonhole, buttonhook, buttress, buxom, buy, buy off, buy out, buy up, buyer, buzz, buzz off, buzz-word,