now or never

Adverb

idiomatic not-comparable

(idiomatic, set phrase) At this sole opportunity, or not at all.

Japanese Meaning

今しかない、今でなければならない、一度きりの機会

If we don't seize this chance, it's now or never to finish the project before the deadline.

このチャンスを逃せば、締め切り前にプロジェクトを終わらせる機会は二度とありません。

Sense（1）

(idiomatic, set phrase) At this sole opportunity, or not at all.

Mamma mia, even if I say

"Bye-bye", leave me now or never

now

（ canonical ）

never

（ canonical ）