Bitesize Business English Lesson #25: Cost

The video tutorial explains the concept of 'cost' as both a noun and a verb. As a noun, it refers to the amount of money needed for something, while as a verb, it involves calculating future expenses. The tutorial also covers idiomatic expressions involving 'cost', such as 'cost an arm and a leg', which means something is very expensive, and 'cost somebody dear', indicating a significant sacrifice. These idioms highlight the various ways 'cost' is used in everyday language.

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