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.
¶YACK, v.2 To push deeper in, esp. of a plough, in order to make a deeper furrow (Cai. 1921 T.S.D.C.).
[Phs. an erroneous form of Yark.]
