The phrase "letting it out" can refer to a variety of actions, including expressing emotions, speaking one's truth, or releasing pent-up energy. There are multiple synonyms that can be used to convey this idea, such as venting, releasing, unleashing, divulging, confiding, revealing, or sharing. "Venting" often suggests a more intense expression of frustration or anger, while "releasing" or "unleashing" can imply a physical outlet for pent-up energy. "Divulging" and "confiding" tend to emphasize the confidential or personal nature of what is being shared, while "revealing" suggests a more public or intentional disclosure. Ultimately, the synonym chosen will depend on the nature and intention behind the action of "letting it out".