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Thrum: “any thread end in a fabric” “any odds and ends” “A rummaging or fumbling about; intimate or clandestine dealings, freq. implying something underhand or illegal.”

Thrummie: “frayed”

Bizzum: “A term of contempt applied to a person, gen. a woman; some times to a woman of loose character”

Thrum n.1, v.1“. Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd.
Besom n.“. Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd.