weatherglass : Idioms & Phrases
Index
Poor man's weatherglass
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noun herb with scarlet or white or purple blossoms that close at approach of rainy weather
Anagallis arvensis; red pimpernel; scarlet pimpernel.
WordNet
(Bot.) , the red-flowered pimpernel (Anagallis arvensis ), which opens its blossoms only in fair weather.