Английский словарь американских идиом - make a dent in

{v. phr.}, {informal} To make less by a very small amount; reduce slightly. - Usually used in the negative or with such qualifying words as "hardly" or "barely". * /John shoveled and shoveled, but he didn't seem to make a dent in the pile of sand./ * /Mary studied all afternoon and only made a dent in her homework./