To Run Around
intransitive verb, godan verb
You've seen the words 走る (to run) and 回る (to revolve). So, when you're running and revolving while you're doing it, you're running in circles. So, the verb form of that is to run around.
The readings are those like the words 走る and 回る. Make sure you know those words from before and apply that knowledge to read this word as well.
うちの犬は、雪を見ると走り回る。
My dog runs around when she sees the snow.
夏休みは小さい子も大人も、ビーチで走り回る人が多いです。
During the summer vacation, there are many small children and adults running around on the beach.
社長は今日も会社の中で走り回っています。
The president is running around in the company today as usual.