Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
SHANNAGH, n. in phr. it is ill shannagh in (someone), it is ungrateful or spiteful in (someone to do such and such) (Sc. 1825 Jam.).[Orig. obscure. Phs. a mistake for it is ill shawn on, it looks bad of, etc. See Shaw, v., 3.]
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"Shannagh n.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 6 Oct 2022 <http://www.dsl.ac.uk/entry/snd/shannagh>