'go-between' originates from the combination of 'go' and 'between', where 'go' meant 'to move' and 'between' indicated 'in the space separating two points'.

'go-between' evolved from the Middle English phrase 'go bitwene', which was used to describe someone who moved between two parties to facilitate communication.

Initially, it meant 'someone who moves between', but over time it evolved into its current meaning of 'intermediary'.