Lewis & Short

intĕr-ĕquĭto, 1, v. n. and a., to ride between (a favorite word with Livy).

        1. (α) Absol., Liv. 34, 15, 4; 35, 5, 10; Curt. 4, 13, 22.
        2. (β) With acc.: ordines, Liv. 6, 7, 3: agmina, Curt. 4, 13, 1.