Wiktionary
adv. 1 One behind the other. 2 together.
Usage examples of "in tandem".
So they worked in tandem, one drawing in air, the other giving it while the water swirled down.
It was little more than a wedge with curves, a javelin equipped with two different kinds of enginesa ramjet and rocket engines that worked in tandem to enable the craft to fly in a vacuum.
We have no way of knowing if they work in tandem during their setup stage.
All I know is that this story, and the others I did with Henry, were the first collaborations I ever tried, and they were such happy experiences that they influenced my thinking about working in tandem with other writers and--this book came into being.
More often than not, capable and well-trained human brains, working in tandem with the best military hardware, including state-of-the-art optelectronic computers, could at least hold their own against whatever hardware and software berserkers could put up.
She explained each step, neither of them fully aware they were working in tandem and enjoying it.