A couple of drunks were duking it out.两个醉鬼扭打成一团。

Scientists duked it out [=argued] over the causes of global warming.科学家就全球变暖的原因争论不休。

Airlines are duking it out [=competing] for customers by lowering airfares.各家航空公司通过降低票价吸引乘客。