make a dent, Informal.to cause a person to take heed; make an impression: The doctor told him to stop smoking, but it didn't make a dent.
8.
make a dent in, to show initial progress; pass an initial stage of (work, thought, solving a problem, etc.): I haven't even made a dent in this pile of work.
Origin: 1250–1300;Middle Englishdente, variant of dint