What is another word for study at sour?
Pronunciation: [stˈʌdi at sˈa͡ʊ͡ə] (IPA) 
The phrase "study at sour" could have several possible synonyms, depending on the intended meaning. If the phrase refers to studying in a difficult or unpleasant environment, synonyms could include "study in discomfort", "study under duress", or "study in adversity". Alternatively, if the phrase refers to studying intensely or with focused attention, synonyms could include "study diligently", "study earnestly", or "study with determination". Other possibilities might include "study in challenging circumstances", "study in a harsh environment", or "study with grit". Ultimately, the most suitable synonym would depend on the context and intended meaning of the phrase.
