The flashcard defines 'impugn' as a verb meaning 'to call into question' or 'to challenge'.
impugn 是一个动词，意思是“责难”或“攻击”；“指摘”。
| Front | impugn [im-(in-);pugn] |
|---|---|
| Back | v.责难，攻击； 指摘 |
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