on the knocker

• 挨户访问,挨户售货,赊账

on the knocker的用法和样例：

例句

1. All the furniture in the house was bought on tick.
   这所房子里所有的家具都是靠赊账买来的。
2. There is also the question of whether to buy on credit or to pay cash.
   还有一个问题就是是赊账还是支付现金购买。