watch their backs是什么意思?

母语人士的回答
Rebecca
watch one's back这个词的意思是小心,防止意外的危险。简而言之,这意味着对某人保持谨慎和警惕。示例: You watch my back and I'll watch yours. (你看我的背,我看你的背。) Ex: Even though she was careful to watch her back, she didn't anticipate her friend's betrayal. (她小心翼翼不受伤,没想到朋友背叛了她。)