Sentence:  Mary Gowd, with her frumpy English hat and her dreadful English fringe, and her brick-red English cheeks, which not even the enervating Italian sun, the years of bad Italian food or the damp and dim little Roman room had been able to <WSD>sallow</WSD>. 
Meaning of the word marked with <WSD> tags:  To cause (someone or something) to become sallow.