Sentence:  The huge square box, parquet-floored and high-ceilinged, had been arranged to display a suite of bedroom furniture designed and made in the halcyon days of the last quarter of the nineteenth century, when modish taste was just <WSD>due</WSD> to go clean out of fashion for the best part of the next hundred years. 
Meaning of the word marked with <WSD> tags:  Having reached the expected, scheduled, or natural time.