"Breathe easy" is a phrase often used to describe a feeling of relief or calmness in a difficult situation. However, there are several other synonyms that can also convey the same message. For instance, "relax" means to become less tense, anxious, or stressed. "Unwind" is another term that implies letting go of tension and stress to feel relaxed. Similarly, "take it easy" or "let your hair down" suggest taking a break from stress and worries. Likewise, "exhale" refers to releasing tension by breathing out and letting go of negative thoughts. Overall, there are various synonyms for "breathe easy", and using them can help to convey the message of relaxation or relief in different shades of meaning.