Ilk. caun adj. “bowed, bow-shaped, bent”
An adjective meaning “bowed, bow-shaped, bent” developed from the primitive form ᴹ✶kuʒnā (Ety/KUƷ). The middle diphthong went through various sound changes as indicated in The Etymologies. First the [u] became [o] preceding the final [a] (kogna), then the [g] (from ✶ʒ) vocalized to [u] before the [n] (coun) and finally the diphthong [ou] became [au] (caun).
Reference ✧ Ety/KUƷ ✧ “bowed, bow-shaped, bent”
|ᴹ✶kuʒnā > kogna > coun > caun||[kuɣnā] > [kuɣna] > [koɣna] > [kogna] > [kouna] > [koun] > [kaun]||✧ Ety/KUƷ|