Dunder

//ˈdʌndə(ɹ)// noun, slang

Definitions

Noun
  1. 1
    The lees or dregs of cane juice, used in the distillation of rum. Caribbean, uncountable

    "The use of dunder in the making of rum, answers the purpose of yeast in the fermentation of flour."

  2. 2
    A double underscore, __. informal

    "Python has a dunder method, __iter__, that defines what the behavior is for looping over an instance."

  3. 3
    Distillery effluent. Australia, uncountable

Etymology

Etymology 1

Compare Spanish redundar (“to overflow”).

Etymology 2

Blend of double + under(score).

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