Put the acid on (someone) Australia informal
If you put the acid on someone, you beseech or plead with them for something, especially money or favor.
Don put the acid on me, asking me to lend him my car for a few days. I declined immediately for fear that he would damage it again.
Anna ran out of money so she put the acid on me. Though she never fails to pay me back on time, I never lend her even a penny after learning that she squanders it on alcohol and drugs.
Stop putting the acid on your mother. You should learn to earn money on your own. You're 26!
To ask someone earnestly to do something for you
To persuade someone to do something by cajoling, flattering, or pleading with them.