One after another; -- said especially of horses harnessed and driven one before another, instead of abreast.
A team of horses harnessed one before the other. "He drove tandems." Thackeray. Tandem engine, a compound steam engine having two or more steam cylinders in the same axis, close to one another. -- Tandem bicycle or tricycle, one for two persons in which one rider sits before the other.
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