"tandem" in the noun sense
an arrangement of two or more objects or persons one behind another
2. bicycle-built-for-two, tandem bicycle, tandem
a bicycle with two sets of pedals and two seats
"tandem" in the adverb sense
1. tandem, in tandem
one behind the other
"ride tandem on a bicycle built for two"
"riding horses down the path in tandem"
Source: WordNet® (An amazing lexical database of English)
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