腰間 is read as ようかん (youkan) and means hips.
ようかん
youkan
こし
body (of hair, noodle, paper, etc.)
こしかけ
temporary job while looking for a better job or until one marries
こしかける
to sit (down)
ようぶ
loins
ようつう
lower back pain
こしだか
overbearing
こしあげ
tuck at the waist
こしかけしごと
temporary employment
こしまわり
measurement round the hips
こしけ
leukorrhoea
こしをおろす
to sit down
なみま
interval between the waves