Reverse a position, take back a statement, or otherwise retreat, as in We're sure that the senator will back water on raising taxes. This term literally refers to a vessel that moves backward in the water because its oars, paddles, or paddlewheel are reversed. It soon was transferred to other kinds of reversal. [Second half of 1700s]
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.