1.
Under- is used to form words that express the idea that there is not enough of something. For example if people are underfed, they are not getting enough food.
Make sure that you are not underinsured...
Victorian cut glass is perhaps the most underpriced area of the antique glass market.
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2.
Under- is added to the beginning of nouns that refer to a job or rank in order to form nouns that refer to a less important job or rank.
...the new undersecretary of education.
...clients who wouldn’t deal with an undermanager.
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