[qiāo zhú gàng]
take advantage of sb.'s being in a weak position to overcharge him; fleece; highway robbery; make sb. pay through the nose; make sb. squeal; overcharge; put the lug on sb.; soak; sharp practice; sponge on sb.
fleece a man of his money
向某人敲竹杠
He did her down over selling the house.
买房时他向她敲竹杠。
This sale sounds like sharp practice to me and I want nothing to do with it.
这笔生意听起来好像有点敲竹杠， 我不想做这笔买卖。