From Longman Dictionary of Contemporary Englishone-shotˈone-shot adjective [only before noun] American English ONCEhappening or done only once SYN one-off British English This is a one-shot deal. If it doesn’t work, it’s over.
Examples from the Corpus
one-shot• Scientists and administrators bickered over whether this should be a continuing program in ocean-bottom drilling or a one-shot drive to the mantle.• As with non-co-operative playing of the one-shot game, the tacitly collusive equilibrium still requires information.• They really trust these silly, one-shot tests more than they trust me!• But they are one-shot treatments and so are not subject to the whims of patient compliance with complex drug regimes. 