In tandem

The seats were in tandem.

He runs the shop in tandem with his brother.

In countries such as the US, bird-feeding, birdwatching, and other types of ornithophilic behaviour form the basis of huge conservation efforts, in tandem with science.

Investors were now warier of Underground railways. They had seen that the Metropolitan was bringing in lower returns, having broached its City extensions. But the newly established Metropolitan Board of Works (the first London-wide authority) pressed the District to continue with the next part of the plan - Westminster to Blackfriars - so that the building of the railway could go in tandem with the construction of the new Thames Embankment and the sewer it incorporated.