also: かぜむき
Literal meteorological meaning: the direction from which the wind is blowing.
The wind direction today is northwest.
Figurative use: how things are developing, the current state of affairs, or the prevailing mood/atmosphere. Often used with 変わる, 見る, or 悪い.
The mood of the meeting suddenly changed.
We need to gauge the trend of public opinion.
Midway through the meeting, the mood suddenly shifted.
Lately, things seem to be going against him.
He watched how things were going for a while before speaking up.