duke it out

Reader's　Digest ６月号の記事 "The Scoop on Streaming" からの引用です。

This January, NBCUniversal aired an NFL playoff game exclusively on streaming for the first time in history. In most of the United States (other than the two home cities), if you wanted to watch the Kansas City Chiefs duke it out with the Miami Dolphins in the AFC wild-card game, you forked over the $5.99 Peacoc monthly subscription fee.

"duke it out" は文脈からすると戦う意味だと思いますが、辞書で確認します。

・Collins Dictionary: to fight, esp. with the fists; do battle: The adversaries were prepared to duke it out in the alley
・Cambridge English Dictionary: to fight with fists (= closed hands): In the opening scene, Bond and his adversary are duking it out on top of a train.
・Dictionary.com: to fight, especially with the fists; do battle: The adversaries were prepared to duke it out in the alley.