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Discover LudwigThe phrase "a certain sum" is correct and usable in written English.
It can be used when referring to an unspecified amount of money or a quantity that is not precisely defined.
Example: "The company agreed to pay a certain sum for the project, but the exact amount was not disclosed."
Alternatives: "an unspecified amount" or "a particular sum".
Exact(60)
Santander suspects you were probably promised a certain sum for helping out.
Better yet, you can specify that you will have to pay a certain sum to a cause that you detest.
Of course, you have to leave a certain sum of money for your instructions to be taken seriously.
Mr. Sharma will also be given a certain sum, known as "gratuity"— a token of gratitude for decades of service.
But from his point of view, what is the difference between being fined and taxed a certain sum for doing a certain thing?
They sent agents to the parents of the victims, or to other relatives, and offered them a certain sum of money as a reparation for their loss.
You would pay them dollars (or whatever currency) for a certain sum of Liberty Reserves, which they would then deposit into your account.
"Until now the state hasn't proposed a certain sum or asserted that it is willing to take its pre-emption rights".
He read in Sylvia Porter's financial column that when she didn't earmark a certain sum for saving in U.S. bonds, it just frittered away in dribs & drabs.
Government officials don't just accept bribes but actively solicit them: businesses have become used to approaches by officials who hint that a certain sum will prevent "problems".
In the case of the perpetuity, the undertaking is to pay a certain sum each year or other interval of time for the indefinite future.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com