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knock off = reduce
examples:
- Lucky for us, they knocked off the price.
- They knocked off 200 euros and we decided to buy it.
- I am sure you can knock off a few more dollars.
- They knock off 10% if you pay right away.
- We managed to knock 300 euros off the price.
- She is quite old but her make-up and clothes really knock years off her age.
