back water

back water idiom
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]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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