Bravo
来自Big Physics
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mid 18th century: from French, from Italian, literally ‘bold’ (see brave).
wiktionary
From Italian bravo. Doublet of brave.
etymonline
bravo (interj.)
"well done!," 1761, from Italian bravo, literally "brave" (see brave (adj.)). Earlier it was used as a noun meaning "desperado, hired killer" (1590s). Superlative form is bravissimo.
It is held by some philologists that as "Bravo!" is an exclamation its form should not change, but remain bravo under all circumstances. Nevertheless "bravo" is usually applied to a male, "brava" to a female artist, and "bravi" to two or more. ["Elson's Music Dictionary," 1905]
