To force someone to do something that is entirely beyond their capabilities or for which they are not suited; to make someone undertake a task they are not fit for.
让他负责这个复杂的项目，简直是赶鸭子上架，他根本没有这方面的经验。
Making him responsible for this complex project is like driving a duck onto a perch; he has no experience in this area at all.
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