Gird up your loin exams are approaching near.
Is the use of the idiom correct in the sentence.
The idiom is fine in this context. However the grammar is not. " Also, don't use both "approaching" and "near" (these refer to similar events, but do not mean the same.
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The idiom is fine in this context. However the grammar is not. You need to add punctuation or a connecting between "loins" and "exam." Also, don't use both "approaching" and "near" (these refer to similar events, but do not mean the same. Choose one.)
You can say:
Gird up your loins because exams are approaching.
Gird up your loins because our exams are near.
Gird up