身八つ
みやつ
small opening in the side of some traditional Japanese clothing (located where the sleeve meets the bodice, below the armpit)
身八口 is read as みやつぐち (miyatsuguchi) and means small opening in the side of some traditional Japanese clothing for women and children (e.g. kimono, yukata) (located where the sleeve meets the bodice, below the armpit).
みやつぐち
miyatsuguchi