Meaning of “roundabout” - Learner’s Dictionary

roundabout

noun [ C ] uk us /ˈraʊndəˌbaʊt/ UK
ROADS (US traffic circle)

A2 a circular place where roads meet and where cars drive around until they arrive at the road that they want to turn into:

to go round a roundabout
ENTERTAINMENT (US merry-go-round)

an entertainment that goes round and round while children sit on it

(Definition of “roundabout noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)