A wide turn; taking a large-radius turn (e.g., when a vehicle or bicycle turns widely rather than cutting close).
大型トラックは狭い道で大回りして曲がった。
The large truck made a wide turn when turning on the narrow street.
次の交差点は急なので、大回りして進んでください。
The next intersection is sharp, so please make a wide turn.
A detour; going the long way around rather than taking the shortest route. Often used as the verb '大回りする'.
渋滞を避けるために大回りして帰った。
I went home by a detour to avoid the traffic jam.
そのルートは短いけれど信号が多いので、大回りするのが早い。
That route is shorter but has many traffic lights, so taking the long way is faster.
観光のために駅からホテルまで大回りして名所を見て回った。
For sightseeing, we took the long way from the station to the hotel and visited landmarks.