brash : Idioms & Phrases
brash oak
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noun small deciduous tree of eastern and central United States having dark green lyrate pinnatifid leaves and tough moisture-resistant wood used especially for fence posts
post oak; box white oak; iron oak; Quercus stellata.
WordNet
Water brash
(Med.) , an affection characterized by a spasmodic pain or hot sensation in the stomach with a rising of watery liquid into the mouth; pyrosis.
Webster 1913
Weaning brash
(Med.) , a severe form of diarrhea which sometimes attacks children just weaned.