First Lessons in Maori
Doubling the di-syllabic root of a verb gives it a frequentative force. Doubling the first syllable only often gives intensity; but sometimes it denotes reciprocal action.
Kimo, wink the eyes.
Kimokimo, wink frequently.
Kikimo, keep the eyes firmly closed.
Patu, strike. Papatu. strike against one another: clash.