They go round in circles (4)
I believe the answer is:
arcs
This could be a double definition.
'they' is the first definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?
'go round in circles' is the second definition.
The definition and answer can be both shapes as well as being plural nouns.
Maybe they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for arcs that I've seen before include "Segments of a circle" , "Parts of a circle" , "Curving trajectories" , "Portions of a circle" , "Bows" .)