The phrase "chills bone" refers to a feeling of extreme coldness that can send shivers down one's spine. Some common antonyms for this phrase include "warmth," "heat," and "comfort." These words refer to sensations that are the opposite of feeling cold or chilled. Other antonyms for "chills bone" could include "calmness," "ease," and "serenity," as these words are often associated with feelings of relaxation and tranquility. Regardless of the specific antonym used, the idea is to convey a feeling that is the opposite of the discomfort and unease associated with feeling cold to the bone.