Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
YACKIE, n. In comb. yackie-thunder, “a sudden startling noise which proves to be nothing serious” (Ork. 1958 Ork. Herald (25 Feb.) 3, Ork. 1974).
[Orig. doubtful, phs. a slurred form of yerk o thunder, see Yerk, n., 1.(2).]