double up

“So if you have two of those, you double up on that.”

One in seven people in the world use the app, which also doubles up as a huge marketplace for buyers and sellers across the world, from the US to Germany, Indonesia to the Philippines.

I'm excited to see how he performs against teams that are more than likely going to double up against him.

The Coastguard rescue helicopter based in Sumburgh doubles up as the island's ambulance, but the nurse is the one people go to for everything else.

Kimmel’s Italian heritage from his mother’s side gave him the option to double up his citizenship.