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.
REEVACK, n. Also in comb. skin-reevack, a piece of hide tied round the end of the spear or plunger in a boat's pump which acted as a valve by opening out on the upward stroke and so forming a lock (Cai. 1966). [Dim. form of reeve, Ruive, a rivet or burr.]