1. frail, weak ...c1460 obs.
2. liable to break, easily broken; fragile, brittle
...1468 obs. exc. Eng. & Amer. dial.
3. delicate, ticklish; requiring cautious handling ...1568 obs.
4. changeable, uncertain; fickle, not trustworthy
...1872 Eng. & Amer. dial.
5. eager, keen, industrious, ambitious ...1902 Amer. dial.
6. of sheep and cattle: given to break fences ...Eng. dial.
to flake or peel because of brittleness ...1936 Amer. dial.
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A parallel form to Middle English bruchel (-y-), pointing to Old English type *brycel, brycl-es (cf. the mod. forms much, mickle, earlier Scottish mekyl, from Old English mycel, mycl-es):—Old Teutonic*brukilo-, from pa. pple. stem of brek-an (Old English brecan) to break; cf. the parallel brittle:—Old English brytel:—Old Teutonic *brutilo- from pa. pple. stem of bréotan. See also the doublets britchel, brockle, bruckle.
(for definition 1)
From: Certain Ancient Tracts Concerning the Management of Landed Property
The Boke of Husbandry