Finding just the right word to express a certain sentiment can be a difficult task, and this is especially true when it comes to finding synonyms for the phrase "shifted one's ground." Some potential options include changing one's stance, altering one's position, modifying one's viewpoint, evolving one's opinion, or adapting one's perspective. Each of these phrases carries a slightly different connotation but all refer to the act of changing or adjusting one's position on a particular issue. Whether you're trying to convey a subtle change in outlook or a complete reversal of opinion, there is sure to be a synonym that fits the bill.