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On this one occasion or occurrence, if (or but) not on another. For once, I'd like to see you take responsibility for your actions, instead of always trying to foist it on someone else.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
(just) for ˈonce,
just this ˈonce(spoken) on this occasion (which is in contrast to what happens usually): For once he was early. ♢ Try and get here on time for once, will you? ♢ Can’t you two be nice to each other just this once?
Farlex Partner Idioms Dictionary © Farlex 2017