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What is an idiom? An idiom is a phrase where the words together have a meaning that is different from the dictionary definitions of the individual words.
Learning English idioms should be a part of any decent english online course. It's almost impossible to guess the meaning of an idiom, you have to learn it by heart like english grammar or english vocabulary.
mark something up / down - to reduce or raise the price of something;
This coat has been marked down from $10 to $8.