Definition & Meaning of "slug it out"in English

What does "to slug it out" mean in slang?

The structure combines "slug" (to hit hard with a fist) with "it out" (to continue until a resolution), forming a verb phrase that describes prolonged, effortful conflict. It is used to describe fighting or arguing intensely until one side wins, often implying that both participants are exchanging heavy blows or strong arguments without backing down early. People typically say two boxers "slugged it out" for all twelve rounds, or two politicians "slugged it out" during a debate.