損じ is read as そんじ (sonji) and means slip.
そんじ
sonji
そこなう
to fail to ...
そんがい
damage
そんしつ
loss (of assets, profit, etc.)
そん
disadvantage
そんとく
loss and gain
そこねる
to miss one's chance to (do something)
そんする
to lose (money, etc.)
そんきん
financial loss
そんじる
to harm
そんき
そんとくなし
even (of a trade)
そんしょ
damaged spot