A large one-time payment of money. Bloomberg Financial Dictionary
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lump sum UK US noun [C, usually singular] (also lump)
► an amount of money that is paid in one large payment on one occasion: »
She received a lump sum of €70,507 when she retired.
be paid/taken as a lump sum »The entire amount can be taken as a lump sum.
»If the pension is small, it may be paid as a one-off lump sum payment at age 65.
Financial and business terms. 2012.