Underground Shopping Mall
Underground Shopping Center, Shopping Centre
noun
An underground (地下) street isn't as underground streety as it sounds. A lot of the underground streets and areas in Japan tend to be underground shopping malls, though. That or subways/trains, but underground shopping centers are way more interesting.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ちょっくら地下街に行くところだよ。
I’m off to the underground shopping mall.