The phrase "bottle out" means to lose one's nerve or courage, to be intimidated or frightened in a situation that requires action. Some antonyms for "bottle out" include being brave, courageous, confident, daring, bold, fearless, and unflinching. These words describe individuals who are not afraid to take risks, face challenges, and approach difficult situations with determination and strength. People who possess these qualities do not hesitate or shrink from a task, and they are not easily daunted by obstacles or setbacks. In contrast to those who "bottle out," they are persistent, tenacious, and resolute, and they have the ability to overcome their fears and achieve success.