The word "酣战" is formed by combining the character "酣", meaning intense or fervent, derived from its semantic component "酉" (related to alcohol) and phonetic component "甘" (sweet), with the character "战", meaning battle, which consists of the semantic component "戈" (weapon) and phonetic component "占". The combination yields a compound word where "酣" intensifies "战", directly conveying the meaning of a fierce or protracted battle.