One of the mysteries of the English language finally explained.
1Irish English a knot which is difficult to undo (now rare).
2A fungal disease of fruit trees characterized by the formation of irregularly shaped rough black swellings on the bark; (also, more fully "black knot fungus") any of several fungi causing this disease, especially Dibotryon morbosum, chiefly affecting plum and cherry trees.
Mid 19th century; earliest use found in Irish Penny Journal.
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