Start with a skid road: the track down which dragged timber. At the bottom of it were the cheap streets where the stayed between jobs, and by the 1850s that corner of Seattle was the skid road. The name spread to other cities, lost its timber, and came to mean the worst-off part of town. Then it slid one step further, off the map altogether: a person can be on skid row, meaning their own life has gone all the way down.
From the word’s history
Wiktionary derives skid row from skid road, the road along which logs were dragged; in 1852 skid road was applied to the loggers' slum in Seattle, and the variant skid row later came to mean a district frequented by alcoholics and hobos even where there was no lumber industry.
Wiktionary 說 skid row 來自 skid road，也就是拖木頭的那條路。一八五二年，skid road 被用來指西雅圖伐木工人聚集的貧民區；後來變體 skid row 擴散開來，連沒有木材業的城市也用它指那種街區。名字裡的「滑下去」就這樣一路留著。
Wiktionary, "skid row"
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