'securely-linked' originates from the combination of 'securely' and 'linked', where 'securely' means 'in a safe manner' and 'linked' means 'connected'.

'Securely' and 'linked' have been used separately in English since the Middle Ages, but their combination into 'securely-linked' is a modern usage.

Initially, 'securely' and 'linked' were used separately to denote safety and connection, respectively. Their combination emphasizes a strong, safe connection.