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to portend
01
to serve as a sign or indication of a future event
例
The distant rumbling of thunder may portend an approaching thunderstorm.
The sudden drop in the stock market portends economic challenges ahead.
The sudden change in leadership last year portended a shift in company strategy that became apparent in the subsequent quarters.
The dark clouds gathering on the horizon portend a heavy rainfall later in the day.
The eerie silence in the forest seemed to have portended an approaching storm, which eventually swept through the area.