Hello everyone. We hope you are doing well.
Today's idiom is "lump sum".
This means one big payment.
Example 1
After the divorce, Mr Tan had to pay his ex-wife a lump sum
of $ 3 million dollars.
Example 2
A. You can buy my car for $ 25,000 dollars.
B. I can pay you a little each month, but I can not pay you a lump sum .
https://dictionary.cambridge.org/dictionary/english/lump-sum