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cost

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1cost/ˈkɑːst/noun
pluralcosts
1cost
/ˈkɑːst/
noun
pluralcosts
Learner's definition of COST  
: the price of something: the amount of money that is needed to pay for or buy something
[count]
[noncount]
Synonyms see: 1price
[count] : an amount of money that must be spent regularly to pay for something (such as running a business or raising a family)— usually plural
— see also cost of living
: something that is lost, damaged, or given up in order to achieve or get something
[noncount]
— often used after at
[count]
◊ To do something at all costs or (less commonly) at any cost is to do it even if you have to suffer, work very hard, lose everything you have, etc.
costs [plural] : the money used to pay for a court case

at cost

US
◊ If you buy or sell something at cost, you buy or sell it for the amount of money that was needed to make it or get it.

at no cost

— used to say that something is free

count the cost

— see 1count

to your cost

chiefly British
: from your own bad experience
2cost/ˈkɑːst/verb
costscostcosting
2cost
/ˈkɑːst/
verb
costscostcosting
Learner's definition of COST  
[+ object]
: to have (an amount of money) as a price
◊ If something costs a certain amount of money, you have to pay that amount of money in order to buy it, use it, or do it.
   b : to cause (someone) to pay an amount of money
◊ If something does not cost (you) a penny or (US) cost (you) a dime/nickel, you do not need to pay any money for it; it is free.
: to cause (someone) to lose something
◊ If something costs you dearly/dear, it causes you to lose something or to suffer a lot.
   b : to cause (someone) to experience something unpleasant
British, business 
past tensecosted
: to determine how much money will be needed to pay for (something)— usually used as (be) costed— often + out
— see also costing
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