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t̓pəpusəs.

They fell on their face.

put iksčúnm̓ áɬiʔ maˤn̓ aláʔ kiʔ t̓pəpusəs aláʔ ilíʔ sk̓ɬk̓mil̓s. - I was just going to tell him that when he fell on his face right there in front of me.