whitiapu
1. (verb) downward blow (e.g. with a taiaha) - from the popotahi verticle guard position the blade of the taiaha strikes down on the head of the enemy.
He rite tonu ka whakarehu te toa, kātahi ka whitiapu ki runga i te mātenga, i te pakihiwi rānei o te tangata (Te Ara 2017). / The warrior would thrust from below with the taiaha blade, then struck the head or shoulder of the person with a downward blow.