схватиться в противоборстве(букв. и перен.: "the two fighters locked in combat"; "the two political parties were locked in a verbal combat" Рина Грант)
схватиться врукопашную(с артиклем или без, напр.: the two fighters were locked in hand-to-hand combat", но: "the two fighters locked in a desperate hand-to-hand combatРина Грант)
схватиться в рукопашной(с артиклем или без, напр.: the two fighters were locked in hand-to-hand combat", но: "the two fighters locked in a desperate hand-to-hand combatРина Грант)