What does "side street" mean?

A secondary road; a road that is not intended for heavy traffic.

Side street

Common synonyms include: alternative path, back door, back stairs, back way, backstreet, backup option.

noun

noun ·Rare ·Advanced level

Noun

1
A secondary road; a road that is not intended for heavy traffic.
"Traffic was horrible on the main roads, but she knew all the back roads and side streets, and managed to get there quickly."
2
a street intersecting a main street and terminating there wordnet

"Traffic was horrible on the main roads, but she knew all the back roads and side streets, and managed to get there quickly."