A more thorough explanation:

An impeachable offense is a legal term used to describe an action committed by a public official that can lead to their removal from office. The process of impeachment involves two steps, with the first being the impeachment itself and the second being a vote in the U.S. Senate to determine whether the official should be removed from office.

The U.S. Constitution specifies that the President, Vice President, and all civil officers of the United States can be removed from office on impeachment for "Treason, Bribery, or other high Crimes and Misdemeanors." However, the exact meaning of this language has been the subject of much debate.

For example, during the impeachment and trial of President Bill Clinton, two articles of impeachment were returned by the House of Representatives. The question arose as to what type of misdemeanor would be sufficient to warrant impeachment, and whether the term "high crimes" modifies misdemeanors as well. However, no definitive answer was reached during the proceedings.

One example of an impeachable offense might be a public official accepting a bribe in exchange for political favors. This would be considered an offense that undermines the integrity of the office and violates the public trust. Another example might be a public official using their position to engage in illegal activities, such as embezzlement or fraud.

These examples illustrate the definition of an impeachable offense because they involve actions that are considered serious violations of the public trust and the duties of the office. They are actions that can lead to the removal of the official from their position, as they undermine the integrity of the office and the government as a whole.