Antonyms for the phrase "puts up an argument" are "accepts," "agrees," "concurs," "yields," and "defers." When someone puts up an argument, they are resisting or disputing something that has been presented. On the other hand, if someone accepts, agrees, or concurs with what has been put forth, there is no need for an argument. Yielding shows a willingness to compromise, while deferring suggests a willingness to let someone else take the lead or make a decision. These antonyms demonstrate the range of attitudes one can have towards an idea or proposition, from complete opposition to total acceptance.