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shift (one's) ground
To adopt a different viewpoint or opinion. I was shocked when Liz suddenly shifted her ground and started seeing things as I did.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
shift one's ground
Fig. to change one's opinions or arguments, often without being challenged or opposed. At first Jack and I were on opposite sides, but he suddenly shifted ground and started agreeing with me. Jim has very fixed views. You won't find him shifting his ground.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.