The phrase "a considerable dent in" is correct and usable in written English.
It can be used to describe a significant impact or reduction in something, often in terms of progress or quantity.
Example: "The new policy has made a considerable dent in our overall expenses this quarter."
Alternatives: "a significant reduction in" or "a substantial impact on".
The setback last month made a considerable dent in that gain.
After a shaky two years, the company is again profitable, has made a considerable dent in its debt and has been rapidly introducing new products.
It makes a considerable dent in the HD universe: until now, capturing HDTV video has required a special professional TV camera that can be yours for the low, low price of $100,000.
Mr. Honoré's "Belle Personne" won her a César (the French Oscar) nomination for most promising actress in 2009, and she has since made a considerable dent in the Hollywood consciousness, last year seducing Owen Wilson in "Midnight in Paris" and plotting to kill Tom Cruise in "Mission: Impossible — Ghost Protocol".
While it poses little chance of making a considerable dent in a smartphone market that's already dominated by a handful of players, Bada was being looked at as a way for Samsung to reduce their reliance on Google's own mobile OS.
The volume of first-class letters has dropped off sharply with the rise in online bill pay, putting a considerable dent in the postal service's revenues.
While Manchester City, who secured a place among the top seeds in Monday's draw by topping Group D ahead of Italian champions Juventus, have been given a favourable two-legged tie against Dynamo Kiev, London's prospects of extended participation in the competition suffered a considerable dent, with Arsenal and Chelsea handed the most difficult draws possible.
Macri made a considerable – and surprising – dent in the popularity of Fernández de Kirchner's anointed incumbent, Daniel Scioli.
Among Republicans, polls published since the Iowa caucus suggest a slight dip in support for Donald Trump, but not enough to make a dent in his considerable lead in the state.
Forty billion makes hardly a dent in a trillion trillion.
