腰間 is read as ようかん (youkan) and means hips.
ようかん
youkan
こしかけ
temporary job while looking for a better job or until one marries
こし
body (of hair, noodle, paper, etc.)
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
こしをあげる
to get up (from sitting)
なみま
interval between the waves
くかん
interval