regret

悔 is composed of the radical of 心 (heart) and 每 (each). Since 每 originally referred to a woman with strong reproductive vitality and extended to convey the ideas of frequency and repetition. When an ordinary person makes a mistake, they tend to repeatedly ruminate on their actions, generating a recurrent sense of resentment, distress, or sorrow within their heart, such emotional pain is represented by 悔.