Russian ⇄ Chinese Danish English French German Hungarian Italian Japanese Lithuanian Norwegian Bokmål Polish Spanish Tajik +

корпеть над книгой stresses
Makarov.	mouse over a book
корпеть над книгами
gen.	burn the midnight oil; stew over books
idiom.	be hitting the books (Andrey Truhachev); pore over one's books (Andrey Truhachev)
slang	sap