godan verb (-tsu)
show signs of emotion; reveal feelings in expression or behavior
Describes when someone's inner state becomes visible through their face, attitude, or actions. Often used when a person cannot hide their feelings.
彼は怒りで気色立った。
He showed signs of anger in his expression.
彼女は不安が気色立っている。
Her anxiety is showing on her face.
godan verb (-tsu)
put on airs; act self-important
Used when someone behaves in a way that shows they think highly of themselves, often with a negative nuance.
彼は昇進してから気色立っている。
He's been putting on airs since his promotion.
godan verb (-tsu)
become lively with voices and noise
Describes a place or gathering becoming animated, with people talking and making noise. Somewhat rare and literary.
宴もたけなわで、座は気色立った。
The party was in full swing, and the room became lively with voices.