The phrase "for once" is an idiomatic expression used to indicate that something is happening that is unusual or rare, often implying a deviation from the norm or an exception to the usual pattern. Here are the key points from the sources provided:
Longman Dictionary of Contemporary English: "For once" is used to say that something unusual happens, especially when you wish it would happen more often. Examples include "Be honest for once" and "For once Colin was speechless" .
YourDictionary: It defines "for once" as an idiom meaning "for the first time, after many instances to the contrary; in a rare exception to the rule; as an exception to the usual" .
Gymglish: The phrase means "for a change, exceptionally; one time, as a single occurrence." Examples include "We could meet at my house for once" and "You're on time... for once in your life" .
English Club: It explains that "for once" can be used when you want something to happen this time, as it rarely or never happens at other times. An example is "I do it all the time. Can't you do it for once?" .
Cambridge Dictionary: It lists "for once" as an idiom used to describe something that happens that does not usually happen .
The Free Dictionary: It describes "for once" as meaning "on this one occasion or occurrence, if (or but) not on another" .
Merriam-Webster: It includes "for once" in example sentences to show its usage, such as "Please be on time this once" and "For once you seem to know what I'm talking about" .
WordReference Forums: It discusses the meaning of "for once" in the context of a song, suggesting it means "finally" or indicating a long-desired event happening .
In summary, "for once" is used to highlight an event or action that is atypical or rare, often with a sense of relief or satisfaction that it is happening this time.

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