Which way the wind blows
Meaning
Figure out which direction public opinion or events will take.
Usage
Used when someone gauges the mood before acting.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Weather metaphor borrowed from sailors checking wind direction.
Phrase has surfaced in English since at least the nineteenth century.