The phrase "lose nerve" generally means to lose courage or confidence in a situation. Some antonyms for this phrase include gaining bravery, feeling emboldened, bolstering confidence, mustering courage, and finding strength. Other possible antonyms include feeling reassured, taking heart, regaining composure, restoring self-assurance, and overcoming fear or anxiety. Ultimately, the opposite of losing one's nerve involves finding inner resolve and a sense of calm in the midst of challenges or difficulties. Whether through positive affirmations, meditation, or other strategies, individuals can work to cultivate these qualities and feel more confident in navigating life's ups and downs.