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on (one's) account
Because of or for the benefit of someone else. Please, don't stop the class on my account. I'll just observe from the back. I can't believe you organized this massive surprise party on my account!
Towards repayment of a debt. At your current monthly payments on account, your loan will be completely repaid in three years.
on someone's account
because of someone. Don't do it on my account. They were late on Jane's account.
[money paid or owed] on a debt. I paid twelve dollars on account last month. Wasn't that enough? I still have $100 due on account.
In part payment of a debt, as in He paid half the amount on account. [Early 1600s]
on (someone's) account
For someone's benefit: It's nice of you to make such an effort on his account.