"undermine the argument" is a correct and usable phrase in written English.
You can use this phrase when you want to make a statement that weakens or undermines another statement or argument. For example, "Although the speaker's point was initially strong, his lack of evidence weakened his argument and ultimately undermined the argument altogether."
No, the point is that Mr. Bernanke's apostasy may help undermine the argument from authority — nobody who matters disagrees!
Although these numbers alone undermine the argument for overseas diversification, a recent study adds fuel to the flame.
To undermine the argument, critics need to show that the key premise (the possibility of a zombie) is false or at least unjustified.
It is hard to believe that tree trunks dragged from frozen bogs in Siberia could undermine the argument about man-made climate change.
The political right uses this concept to undermine the argument made by liberals that the increasingly unequal distribution of income poses a danger to the social fabric as well as to the American economy.
A move on Hama would undermine the argument he and his officials have repeated time and again: They have no objection to dissent, as long as it is peaceful.
Microsoft will file a legal brief with the Supreme Court on Tuesday, seeking to undermine the arguments the government made yesterday.
The findings will undermine the arguments of leading sceptics, such as the former Chancellor Lord Lawson, who have criticised scientists from the Met Office and other climate organisations for not accepting that global warming has stopped since about 1998.
Farmers are diddled out of most of that by the supermarkets, but even if they got it all, they would still be out of pocket.Such findings undermine the arguments of those battling to preserve the worst idiocies of the CAP.
But Ms. Braudy's book also tries to undermine the arguments for Ms. Boudin's legal defense and parole, arguing that her troubled relationship with her father drove her far deeper into radical acts of violence than she has acknowledged.
As arguments against infinitely long linear motion, infinite weight, infinite bodies, etc., the arguments using proportion are not always very successful, since they make certain simplifying assumptions which undermine the arguments.
