The phrase "gets one's dander up" means to become irritable, angry, or agitated. Some antonyms for this phrase include feeling calm, relaxed, serene, composed, and peaceful. When someone is feeling calm, they are not easily provoked, and their emotions remain stable. Relaxed suggests a feeling of ease and comfort, where one can unwind and let go of any tension. Serene implies a sense of tranquility and peacefulness, while composed means being in control and maintaining a level head in stressful situations. Lastly, peaceful suggests a state of quiet and harmony, where there is no disturbance or conflict. These antonyms represent a contrast to the intense emotions that come with "getting one's dander up.