The word "by-streets" refers to the smaller roads or paths that are off the main road or highway. These roads are often used as shortcuts or alternative routes to avoid traffic or congestion on the main road. There are several synonyms for "by-streets" such as alleyways, backstreets, lanes, side roads, or even alleys. These terms are often used interchangeably to describe the same concept and can be found in literature, poetry, and everyday language. The use of these words can add creative flair and imagery to our writing and speech, making it more interesting and engaging.