身共 is read as みども (midomo) and means I.
みども
midomo
しんだい
body
しんちょう
height (of body)
み
one's body
みぶん
one's circumstances
みもと
(one's) character
みうち
one's whole body
みのまわり
one's personal belongings
みぢか
near oneself
みのうえ
one's lot
みより
relative
みなり
dress
みがる
carefree