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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.
shift your ground
if you shift your ground in an argument or a discussion, you start to express a different opinion He's impossible to argue with because he keeps shifting his ground.See Move arse!