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Noun: tinker's damn
Usage: US, informal
  1. Something of little value
    "his promise is not worth a tinker's damn";
    - damn [informal], darn [informal], hoot [informal], red cent [N. Amer, informal], shucks [informal], tinker's dam [US, informal]

Derived forms: tinker's damns

Type of: ineptitude, worthlessness