The phrase "stood one's ground" typically means that a person has maintained their position or opinion despite opposition or pressure from others. However, antonyms for this phrase could include: giving in, backing down, compromising, surrendering, acquiescing, capitulating, yielding, or conceding. In contrast to "standing one's ground," these words imply a willingness to abandon one's position or beliefs in response to outside forces. While there are times when it may be appropriate to yield or compromise, "standing one's ground" can also be a valuable trait in situations that require strong leadership or steadfast determination.