ɐ kˈɑːlk kˈɑːlk ɪz ɐn ˌʌndɚwˈɔːɾɚ vˈɔːɹtɛks kɹiːˈeɪɾᵻd wɛn ɹˈæpɪdli ɹˈʌʃɪŋ wˈɔːɾɚ pˈæsᵻz ɐn ˌʌndɚwˈɔːɾɚɹ ˈɑːbstəkəl ɪn bˈaʊndɚɹi ˈɛɹiəz ʌv hˈaɪ ʃˈɪɹ.
A kolk (colc) is an underwater vortex created when rapidly rushing water passes an underwater obstacle in boundary areas of high shear.