| an indisputable fact or basic truth, esp. one whose accuracy may cause discomfort or embarrassment. |

| home truth n. A key or basic truth, especially one that is discomforting to acknowledge. |
home truth
A key or basic truth, especially one that is discomforting to acknowledge. For example, It's time you told a few home truths here, such as where your campaign finances actually came from. This expression uses home in the sense of "the very heart of a matter." [c. 1700]