File-card meaning

(uncountable) Material with embedded wire teeth used for cleaning files; card-clothing.
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(countable) A tool for removing debris from between the teeth of a file.
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(countable) A tool for removing debris from between the teeth of a file.
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Origin of file-card

  • file (“cutting and smoothing tool”) +‎ card (“material with embedded wire bristles”)
    From Wiktionary