whakatutuki - carry to completion
whakatutuki. 1. v.t. Carry to completion.
2. v.i. Be near the end, be near the highest point. Ka whakatutuki te tai.
Williams Dictionary
Ki te kore e taea e koe, waiho mā tētahi kē atu e whakatutuki.If you cannot manage it, leave it for someone else to complete.