A folder with rings or clips for holding loose papers together, or any device that binds things.
From Old English 'bindan' meaning 'to tie' or 'to make fast,' related to 'bind.' But the surprising connection is to Sanskrit 'bandh' meaning 'to bind,' which also gave us 'band,' 'bond,' and even 'husband' (literally 'house-binder' or one who binds the household together). Ancient Indo-European speakers were obsessed with tying things together!
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