to worry, frivolous
恌 centers on a restless, unsettled state of mind: worrying anxiously or acting in a light, frivolous way that lacks seriousness.
恌 combines the heart radical 忄 with the phonetic component 兆. The exact historical development is uncertain, but it likely expresses a state of mind associated with the sound 兆.
The heart radical 忄 beside 兆 (which can suggest an omen or sign) paints a picture of a heart unsettled by signs and portents, leading to worry or a frivolous, jumpy reaction.
For チョウ, imagine a person named Chou who constantly worries about omens: Chou -> チョウ, and his heart 忄 is always restless beside the omen 兆.