ḵ'alpgyoom hadiks [ḵ'alp/*gyoom/ha/*diks]
intransitive verb. swim backstroke
../mp3s/k_ul_hard/k'alpgyoom_hadiks-dl-hb-01.mp3 Luk'wil wilaays Sam ḵ'alpgyoom hadikst. Sam is real good on his backstroke.

Source: Draft Dictionary entry.