Englishfor English speakers
cost
Noun
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The cost of something is the price that a person pays for it.
What is the cost of the car?
cost
Verb
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When you say that a thing costs, you say that one must pay in order to buy it.
That diamond ring costs a great deal of money.
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One may say that an action costs a certain bad result.
It cost me my job when I broke the machine.
To commit a crime will cost you.
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When you estimate a cost or set a cost, you cost a thing.
The repair man costed the work to fix the car.
account
Noun
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An account is an arrangement with a bank or other company to do business.
I opened a bank account when I moved into town.
The internet company cancelled my e-mail account.
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The records of the money that is paid or received. (often plural)
The accounts show that your bill has already been paid.
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A description of events
The account that he gave didn't match the story that was in the newspaper.
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If you take something into account, you think about it when you decide something.
Effective leaders have to take account of everyone's feelings.
account
Verb
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If mathx/math accounts for mathy/math, it explains why mathy/math happens or exists.
Oh, she was sick. Well, that accounts for her poor test score.