Scottish National Dictionary (1700–)
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First published 1934 (SND Vol. I).
This entry has not been updated since then but may contain minor corrections and revisions.
BACK-THRAWS, n.pl. A drawing back from a promise. [′bɑk′θrɒ:z]n., s.Rxb. 1923 Watson W.-B. 46:
Nae back-thraws! = (in boy's language) No resiling or drawing back, as from a promise, etc.