"Up to his eyes" in this context means that the colleague is very busy or deeply involved with his work. It's an idiom used to describe someone who has a large amount of work to do.
My colleague has been up to his eyes in work ever since he returned from Europe. Here 'up to his eyes' means?
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.