The phrase "breaking neck" is commonly used to describe a sudden and violent movement or action that can result in serious injury. Antonyms for this phrase include gentle, delicate, gradual, slow, and safe. Using these antonyms, you can describe actions that are gentle and careful, such as carefully lifting a fragile object, slowly easing into a yoga pose, or gradually working through a difficult problem. By using antonyms, you can add depth and nuance to your language and communicate more precisely the type of action or movement you wish to describe.