dent
dɛnt/
noun
1.
a slight hollow in a hard even surface made by a blow or pressure.
"there was a hideous dent in the front passenger door"
synonyms: indentation, dint, dimple, dip, depression, hollow, crater, pit, trough; rareconcavity
"her hat had a dent at the crown"
2.
a reduction in amount or size.
"he has barely made a dent in the poverty rate"
synonyms: reduction, depletion, deduction, cut, hole
"lawyers' fees will make a nasty dent in their finances"
antonyms: increase