now-or-never

形容词 adj.
/ˌnaʊəˈnɛvə/    /ˌnaʊəɹˈnɛvəɹ/

英文释义

形容词 adj.
  1. Of a need for a decision, an opportunity, etc.: arising at the present time and requiring action to be taken immediately, or not at all. not-comparable
    — Margaret knew what it was to expect her visitors to return ‘in one moment,’ and with a ‘now-or-never’ feeling she began, ‘Ethel dear, wait,’ but Ethel was too impetuous to attend.

词源

From now or never (adverb).
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