Etymology

dah ‎(“up”) + ii- ‎(contraction of ʼa-hi-) = ʼa- ‎(indefinite 3rd-person object-subject pronoun) + hi- ‎(seriative aspect, one after another) + -s- ‎(ligature) + -tłʼǫ́ ‎(perfective stem, to tie, weave)