| 单词 | impugn | 
| 释义 | im·pugn    (ĭm-pyn)tr.v.  im·pugned, im·pugn·ing, im·pugns   To attack as false or questionable; challenge in argument: impugn a political opponent's record. [Middle English impugnen, from Old French impugner, from Latin impugnāre : in-, against; see  IN-2 + pugnāre, to fight; see  peuk- in the Appendix of Indo-European roots.] im·pugna·ble adj. im·pugner n.  | 
	
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