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Noun: tidy sum
  1. (often followed by 'of') a large number, amount or extent
    "a tidy sum of letters";
    - batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle [archaic], mint, mountain, muckle, passel [US], peck, pile [informal], plenty, pot, quite a little, raft, sight, slew, spate, stack, wad, bunch [informal]

Derived forms: tidy sums

Type of: large indefinite amount, large indefinite quantity