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.
FO, int. Usu. thrice repeated, as a call to cows at milking time (Rxb. 1923 Watson W.-B.; Bwk.2 1952).
[From the similar call Hove, 'ove, 'ove, by a different division of the syllables. See Hove, int.]