1. n. A native shrub (Hedyotis [Kadua] glaucifolia), found only on Kauaʻi, with narrow, tubular, inconspicuous, pale-yellow flowers, and narrow-ovate to heart-shaped leaves; related to the ʻuiwi.
2. Also sopa nvt. Soap; to cover with soap. Eng. Kopa ʻala, perfumed soap. Kopa ʻauʻau, bath soap. Kopa holoi, laundry soap. Kopa pauka, powdered soap.