Antonyms for the phrase "takes on chin" could be "avoids confrontation," "runs away," "back down," "give up," or "surrender." All of these signify strategies or behaviors that suggest a lack of resilience or determination when faced with adversity. Avoiding confrontation, running away, or backing down might be appropriate if there is no realistic chance of winning or if the costs of fighting are simply too high. However, giving up or surrendering means accepting defeat without even trying. In contrast, taking on chin means facing challenges head-on, displaying courage, resilience, and determination to overcome obstacles and achieve one's goals.