Origin

The character 暇 combines the radical 日, which represents the sun or a time period, with the component 叚 on the right, which serves as a sound hint for pronunciation. The left side 日 suggests the concept of time or a cycle of days. When you have spare time or leisure, those are periods when your days are free and unstructured, so the sun-related radical makes sense for marking time that belongs to you rather than being consumed by work. The right component 叚 doesn't contribute a separate meaning but instead hints at how the character should be pronounced.