Going Around
Noun, する verb, and の adjective
じゅんかい
天気予報が外れて、巡回中に雨が降り出しました。
The weather forecast was wrong and it started to rain while I was on patrol.
You patrol and revolve around the block to make your patrol. You're going around patrolling.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.