1. м. в (самом) разгаре — in full swing
работа в самом разгаре — the work is in full swing
лето, сезон и т. п. в самом разгаре — the summer, season, etc . , is at its height
в разгаре спора — at the height of the dispute, in the heat of the dispute
в разгаре боя — at the height of the fighting
в разгаре борьбы — when the struggle was at its height
2. м. (ствола оружия) scoring, erosion