Scottish National Dictionary (1700–)
About this entry:
First published 1941 (SND Vol. II).
BOOKLAG, n. “A big stone” (Cai.8 1934). Cf. Boucklag.Cai. 1916 An Old Caithness Croft in John o' Groat Jnl. (7 April):
Round the corn yard was a dyke built of “booklags” of stones taken from the land.
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"Booklag n.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 26 Sep 2022 <http://www.dsl.ac.uk/entry/snd/booklag>