Left-side heart radical, the vertical form of
心 used along the left edge. It supplies the meaning: an inner state of feeling.
慌 is panic, fluster, alarm — the heart thrown into disarray. The radical anchors the inner-life family:
怕 (fear),
忙 (busy/anxious),
怪 (strange),
怀 (cherish),
慢 (slow-tempered).
