Topic: BICYCLES, CARTS, HORSES

Date: 1700-1800
Language: Latin
Origin: 'finally, at length' (taken to mean "lengthwise", and so used for vehicles with one horse or person in front of another)

tandem

noun
     
tan‧dem [countable]
1TTB a bicycle built for two riders sitting one behind the other
2

in tandem

doing something together or at the same time as someone or something else:
The two companies often work in tandem.
in tandem with
The group operated in tandem with local criminals.

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