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blaw1 noun the bagpipes 20-. etymology: from the action of blowing; attested by JS
blaw2, bla, blau noun meal, flour 19-. etymology: perhaps Romany; form blau also attested in Shelta; blaw also attested by Galloway, Perthshire and Argyleshire Tinkler-Gypsies, BS in TDITA and BS in JS; bla form collected by EMcC/PS; also collected by Simson (1865) and attested by two of his informants and RD note:

Canadian Paul Pope (2013) attests the form bla and defines it as ‘meal’. [His spelling is perhaps indicatiive of his pronunciation]. He also attests the form blaw which he defines as ‘oatmeal’.
blaw3
verb brag la16-.
noun a braggart, boaster 19-. etymology: Scots; attested by SR
blaw4 noun tobacco: Looking for rags or a wee taste o blaw. 20-. etymology: Scots form of English blow; attested by BS in SS