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They broke the cardinal rule of batting in five-day cricket - when you get a start, you have to make it count.
Not only will they be selling low, breaking the cardinal rule of investing, but they will also be locking in their losses.
Sadly, you broke the absolute cardinal rule of renting property (even to friends) - you did not get a signed agreement!
It's my cardinal rule not to play things more than once, but he's the one paying to turn it up so it's difficult.
adjective [ADJECTIVE noun]
Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers
countable noun
Rules are instructions that tell you what you are allowed to do and what you are not allowed to do. [...]
Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers
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