The phrase "a sizable sum of" is correct and usable in written English.
It can be used when referring to a large amount of money or resources.
Example: "The charity received a sizable sum of donations during the fundraising event."
Alternatives: "a substantial amount of" or "a significant sum of".
One person came up with a land deal involving a sizable sum of money – but no evidence that the land even existed.
The Western diplomat said the Afghan man was initially given a sizable sum of money to take part in the talks — and to help persuade him to return.
Eventually, we might be talking about a sizable sum of tax revenue from its sales as medicine, not to mention private investment and employment.
For a sizable sum of money Acton had sublet the running of the prison from the deputy marshal; if he defaulted on his dues, he would be thrown into prison himself.
Green, however, had inherited a sizable sum of money from his family, who had sold part of their estate, and he used the bibliography as a launching pad for a biography of Conan Doyle.
If the FCC loses in court, and the issue heads to the Hill, who wants to wager a sizable sum of money that absolutely nothing would get done.
He estimated that it would cost 10to1212 billion rubles -- $350 million to $420 million -- to rebuild the Chechen lowlands south of Grozny, a sizable sum for a cash-strapped Russia.
Madoff's alleged scam appears to have started to unravel when investors feeling the pain of the credit crunch put in claims for redemptions of $7bn - a sizable sum for a firm that claimed to have $17.1bn under management.
Forking over a sizable sum to get the newest gadget didn't start with the computer chip.
The results of her efforts show: in 1999, the Ford Foundation donated $1 million to the organization, a sizable sum in a period of cutbacks by philanthropic institutions.
But it is a sizable sum in the world of French start-ups, where Viadeo has raised less than 50 million euros over all since it was founded in 2004.
