tūpa‘u,
1. (-a, -‘ia). Replace, substitute or deputise for.
Kua riro nā te tamaiti i tūpa‘u i te metua i te mate‘anga.It was the son who took over from his father when he died;Kua tūpa‘u‘ia ‘aia e Mata i te kino-‘anga tōna vaevae.
Mata substituted for him when he hurt his leg.
2. n. Replacement, successor, heir.
Ka meitaki ‘ua ‘aia ‘ei tūpa‘u.
He‘ll do for a replacement;
Ko tōna tūpa‘u ia.
That is his replacement.