This is the 10482nd most frequent Turkish word.
bulaştığı
"That has contaminated or infected."
Here, 'bulaştığı' refers to the act of a disease getting transmitted to someone, indicating a passive reception of the disease.
Bir hastalık ona bulaştığı için önlemler alması gerekiyor.
Since he contracted a disease, he needs to take precautions.
In this sentence, 'bulaştığı' denotes the act of mud sticking to the pants, symbolizing contamination.
Çamura bulaştığı için pantolonunu hemen temizlemelisin.
Since it got dirtied with mud, you should clean your pants immediately.
Here, 'bulaştığı' is used to describe ink adhering to the hand, expressing the act of getting stained.