study [work] hard, neglecting one's meals;be so immersed in work as to forget one's meals;be roused to such diligence as to forget one's meals;One studied with such eagerness that he forgot his meals. ;

Some of the students were so immersed in their studies that they sometimes even forgot their meals.
有的学生有时候甚至发愤忘食.
来源:《现代汉英综合大词典》
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