Definition of «to form a ring»

The phrase "to form a ring" means to create a circular shape by placing things or people in a circle.

In mammals, head direction cells don't form a ring, but they do act in concert, he says. (sciencenews.org)
The «core» typically sits beneath the city's center, and its stations usually form a ring shape. (scientificamerican.com)
To serve, if you have food forming rings, this is a great opportunity to use them. (taste.narin.com)
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