I swear it was one breath, but it changed to “In one breath” 一気に. I swear it was 一気 before and the url still shows up on Google but shows a 404 error now.
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Yes, it was. You are not going crazy. 
To cite the details from the update page (27h February 2026):
一気に (4) - Updated subject from 一気 to 一気に, changed the primary meaning to “in one go”, added “at once” and “in one breath” to be alternative meanings, added “in one sitting,” “in one fell swoop,” “in 1 go,” “in 1 breath,” “in 1 sitting,” “in 1 fell swoop,” “in a single sitting,” “in a single go,” “without pausing,” “without a rest,” and “at a stretch” to the allow list, added “suddenly,” “all of a sudden,” “instantly,” “in an instant,” “one gulp,” “1 gulp,” “one breath,” “one go,” “one sitting,” “1 breath,” “1 go,” and “1 sitting” to the warning list, and updated the meaning explanation
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