noun
main stage; public arena
Refers to the principal stage in a theater, or metaphorically to a prominent public setting where one performs or is exposed to scrutiny.
彼はついに本舞台に立つことになった。
He finally got to stand on the main stage.
政治家として本舞台に登場する。
He appears on the public stage as a politician.
Compound of 本 (main) and 舞台 (stage). The exact historical derivation is uncertain, but the word is transparently formed from its components.