The word 释怀 (shìhuái) is a compound formed through semantic combination, where the verb 释 (shì), meaning "to release" or "to untie," is paired with the noun 怀 (huái), meaning "bosom" or "heart (as the seat of emotions)." Together, they create a vivid metaphorical expression that literally means "to release the heart," figuratively conveying the idea of letting go of lingering worries, resentments, or emotional burdens that one has been holding onto, thereby achieving a state of relief, peace, or resolution.