An archaic or dialectal term for a coarse weed, possibly charlock or a wild mustard plant found in grain fields.
Possibly from Old English or dialect roots; related to or a variant of 'charlock' (wild mustard), though the etymology is uncertain and this form is now obsolete.
Words like 'chardock' died out because they described weeds nobody bothered naming precisely anymore—modern agriculture and herbicides made folk botanical terminology unnecessary.
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