The term 'Went Sour' can be described by two crossword solutions: 'Turned' (6 letters) and 'CURDLED' (7 letters). 'Turned' is a verb that means to move or cause to move around an axis or center, or to change in direction. 'CURDLED' is a verb that means to become thick and semi-solid, usually due to the coagulation of proteins. In this context, 'Went Sour' can be interpreted as a change in state from something desirable to something undesirable.