It's on numerous sources:
http://www.crf-usa.org/impeachment/high-crimes-and-misdemeanors.html
https://en.m.wikipedia.org/wiki/High_crimes_and_misdemeanors
High" in the legal and common parlance of the seventeenth and eighteenth centuries of "high crimes" signifies activity by or against those who have special duties acquired by taking an oath of office that are not shared with common persons.[1] A high crime is one that can only be done by someone in a unique position of authority, which is political in character, who does things to circumvent justice. The phrase "high crimes and misdemeanors" when used together was a common phrase at the time the U.S. Constitution was written and did not mean any stringent or difficult criteria for determining guilt; it meant the opposite. The phrase was historically used to cover a very broad range of crimes.[2] The Judiciary Committee's 1974 report "The Historical Origins of Impeachment" stated: "'High Crimes and Misdemeanors' has traditionally been considered a 'term of art', like such other constitutional phrases as 'levying war' and 'due process.' The Supreme Court has held that such phrases must be construed, not according to modern usage, but according to what the framers meant when they adopted them. Chief Justice John Marshall wrote of another such phrase:
"It is a technical term. It is used in a very old statute of that country whose language is our language, and whose laws form the substratum of our laws. It is scarcely conceivable that the term was not employed by the framers of our constitution in the sense which had been affixed to it by those from whom we borrowed it."[3][4]
Since 1386, the English parliament had used the term “high crimes and misdemeanors” to describe one of the grounds to impeach officials of the crown. Officials accused of “high crimes and misdemeanors” were accused of offenses as varied as misappropriating government funds, appointing unfit subordinates, not prosecuting cases, not spending money allocated by Parliament, promoting themselves ahead of more deserving candidates, threatening a grand jury, disobeying an order from Parliament, arresting a man to keep him from running for Parliament, losing a ship by neglecting to moor it, helping “suppress petitions to the King to call a Parliament,” granting warrants without cause, and bribery.[5] Some of these charges were crimes. Others were not. The one common denominator in all these accusations was that the official had somehow abused the power of his office and was unfit to serve.[citation needed]"
https://legal-dictionary.thefreedictionary.com/High+Crimes+and+Misdemeanors
"Generally, debate over the phrase high crimes and misdemeanors has split into two camps. The minority view is held by critics who undertake a literal reading of the Constitution. They maintain that high crimes means what it says—criminal activity—and argue that the Framers wanted only criminal activities to be the basis for impeachment. The generally accepted viewpoint is much broader. It defines high crimes and misdemeanors as any serious abuse of power—including both legal and illegal activities. Supporters of this reading believe that because impeachment is a public inquiry, first and fore-most, it is appropriate to read the phrase broadly in order to provide the most thorough inquiry possible. Thus, a civil officer may face impeachment for misconduct, violations of oath of office, serious incompetence, or, in the case of judges, activities that undermine public confidence or damage the integrity of the judiciary."
Many, many more example on The Google...
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