Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
¶PROLL, v. In phr. to proll thumbs, to seal a bargain by each party licking his thumb and pressing it to that of the other party to the agreement.Per. 1753 A. Nicol Rural Muse 14:
All bargains stood by shaking hands Or prolling thumbs.
