Kōpua. 1. a. Deep, of water.
2. Double, of teeth. Ara taea te toru, te wha tau, kua tupu nga niho kopua, kua kaha ki te kai i te kai maro.
3. In the expression maro kopua. ‖ maro.
4. n. Deep pool. Ko te ingoa o taua kopua ko Te Warouri (T. 154).
5. Netted bag to hold the stones forming the karihi, or sinker, of a fishing net.
kōpuapua, n. 1. Pools temporarily filled with water.
2. A plant. Ko taua atua he maro kopuapua, ara he mauku. = mauku.
Williams Dictionary