Definition of milk-bush in US English:

milk-bush

noun

  • Any of various shrubs or small trees of the southern hemisphere which have a milky sap and are often succulent; especially (a) South African and Indian English, the small tree Euphorbia tirucalli (family Euphorbiaceae), native to Africa and cultivated or naturalized in parts of India and South-East Asia; (b) Australian the shrub Wrightia saligna (family Apocynaceae), formerly used as a fodder plant; (c) Australian the caustic bush, Sarcostemma australe.

Origin

Late 17th century; earliest use found in John Ovington (1653–1731). From milk + bush.

Pronunciation

milk-bush

/ˈmɪlkbʊʃ/