1. prostrate or semi-erect subshrub of tropical America, and Australia; heavily armed with recurved thorns and having sensitive soft grey-green leaflets that fold and droop at night or when touched or cooled • Syn: touch-me-not, shame plant, live-and-die, humble plant, action plant, Mimosa pudica • Hypernyms: mimosa • Member Holonyms: genus Mimosa 2. semi-climbing prickly evergreen shrub of tropical America having compound leaves sensitive to light and touch • Syn: Mimosa sensitiva • Hypernyms: mimosa • Member Holonyms: genus Mimosa