Proto-Eskimo: *tapǝt-
Meaning: to fold over
Russian meaning: складывать в несколько раз
Comments: This stem also has the meaning 'to double' and formally looks like a transitive form from *tapǝr-. But it is possible that these are two different roots, and the first one has a specific meaning 'to fold' > 'penknife'. Comparative Eskimo Dictionary: 331