1.
threatening attitude, angry look, fury
A fierce, intimidating manner or expression, especially when someone is angry or ready to confront.
すごい剣幕だった。
They were in a towering rage.
剣幕 describes an intimidating, angry demeanor.
Common patterns
Writing
Also written 見幕 or 権幕; 剣幕 is the usual spelling today.
Usage
Describes the outward appearance of someone's anger or aggression, not the emotion itself.