This is the 1084th most frequent Polish word.
lewej
"Lewej" means "left" (genitive or dative singular form) in English.
In this sentence, 'lewej' is the genitive singular form of 'lewa', used to describe the possession or attribute of 'strony' (side).
Idź w lewo, aż dojdziesz do lewej strony ulicy.
Go to the left until you reach the left side of the street.
Here, 'lewej' is used as the genitive singular form of 'lewa', modifying 'ręce' to specify that it refers to the left hand.
Mam torbę na lewej ręce.
I am carrying the bag on my left hand.
In this context, 'lewej' describes the genitive attribute of 'uliczki', denoting its position relative to the surrounding environment.