lump sum noun
plural ∼ sums [count] : an amount of money that is paid at one time : a single sum of money
▪ The bonus is paid out in a lump sum. [=it is paid out all at once] ▪ a lump-sum payment
▪ The bonus is paid out in a lump sum. [=it is paid out all at once] ▪ a lump-sum payment
