to give someone back less money than they are owed when the person is buying something from you

I think I was shortchanged in the café, because I've only got £5 in my purse when I should have £10. 我觉得小餐馆少找给我钱了，因为我的钱包里本应该有10英镑，而现在只有5英镑。

to treat someone unfairly, by giving them less than they deserve

Children who leave school unable to read and write are being tragically shortchanged. 那些没学会读书写字就离开学校的孩子是不幸的，他们没有受到应有的教育。