an important argument that is intended to end a disagreement that has existed for a long time

The president is preparing for a showdown with Republicans over his plans to reform the economy. 总统正在作准备，打算就他的经济改革计划和共和党人最后放手一搏。

Millions of dollars were spent on lawyers in a courtroom showdown between the two companies. 两家公司在法庭的最后一战光在律师身上就花了数百万美元。