The phrase "small dent" means a minor or tiny damage or indentation on an object, such as a car, that is usually not very noticeable or serious. Full definition
Later levels really showcase this, as longer combos are almost always interrupted, and shorter ones make an extremely small dent in the more powerful zombies. (playstationlifestyle.net)
Used vehicle - had one small dent on the side. (autolist.com)
But we assumed the second - generation Nexus 7 would follow the same trend — a small compromise in specifications for a much smaller dent in our wallets. (pocketnow.com)