Tandem

1. (adv. & a.) One after another; -- said especially of horses harnessed and driven one before another, instead of abreast.

2. (n.) A team of horses harnessed one before the other.

Thesaurus Entries

back to back, behind, behind the scenes, equipage, four-in-hand, in back of, in the background, in the rear, pair, randem, rig, span, spike, spike team, team, three-up, turnout, unicorn