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.
はしりまわる
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.
ニッカはいつもオフィス内を走り回っています。
Nikka is always running around the office.
うちの子なら、あの交通じこからもうすっかり立ち直って、元気に走り回っていますよ。
My kid completely recovered from the traffic accident and now he's just running, full of energy.
コウイチが蜂の巣を撃った後、蜂から逃げるために約十分間走り回った。
After Koichi shot the bee hive, we ran around for nearly ten minutes trying to escape from all the bees.