1. To bump or strike something in such a way as to tip it 打翻
I knocked over a can of paint and spent the next hour cleaning up.
2. to rob something like a bank or a shop 抢劫银行或者商店
bank,store, jewellery store, liquor store, gold shop, gun shop, pawn shop
If drugs were given to addicts，they wouldn't have to knock over stores and shops to get the money to buy them.
They tried to knock over the store and learned a hard lesson when they got caught.
This is typically used in American and Australian English but may be used in other varieties of English too. 这个俚语一般在美国和澳大利亚用的比较多，但是其他英语国家也会用到。