Final answer:
Impugn is a verb that means to challenge the truth or validity of something. It's commonly used in phrases that question someone's integrity or the reliability of facts. It is part of the English language's basic parts of speech.
Step-by-step explanation:
The term impugn is a verb, one of the basic parts of speech, which includes nouns, adjectives, verbs, and adverbs. The definition of impugn is to call into question the truth, validity, or honesty of a statement or motive; to challenge as false or questionable. Common phrases and related phrases often include 'impugn one's integrity,' 'impugn someone's character,' or 'impugn the facts.'
For example, in a debate setting, a politician might impugn his opponent's claims by providing evidence to the contrary, thereby questioning the opponent's credibility. Additionally, in legal contexts, a lawyer might impugn the reliability of a witness to undermine their testimony.