Antonyms for the phrase "struck back" could include "yielded," "surrendered," "submitted," or "succumbed." These words signify the act of acquiescing or giving in, rather than fighting back. Other antonyms could be "forgave," "ignored," or "moved on," indicating a non-confrontational or peaceful approach to a situation. In general, "struck back" implies retaliation or aggression, so antonyms would be words indicating passivity, diplomacy, or forgiveness. By using antonyms for "struck back," we can convey a different tone or mood in a sentence, such as one of conciliation, compromise, or understanding.