Scottish National Dictionary (1700–)
FLATLIN(G)S, adv. Flat(ly), horizontally, at full length (Sh., Abd. 1952); with the flat side (of something). Obs. or dial. in Eng.
Fif. 1827 W. Tennant Papistry 14:
Sic a lounder As . . . dang him flatlins like a flounder. Sc. 1896 A. Lang Monk of Fife 161:
Her sword in hand, wherewith she had smitten me flatlings and not with the edge. Abd. 1906 Sc. N. & Q. (2nd Ser.) VII. 139:
She was buried in St Machar's Churchyard, and a stone laid “flatlins” over her remains.
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"Flatlin(g)s adv.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 17 Mar 2018 <http://www.dsl.ac.uk/entry/snd/flatlings>
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