Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
¶GUG-GUG, n. The cuckoo.Arg. 1896 N. Munro Lost Pibroch 98:
The gug-gug will halloo in your ears to bid you bide a wee and see the red of the heather creep on Tom-an-dearc.