expression, godan verb (-su)
get jealous (of a woman); grow horns (of jealousy)
Idiomatic expression referring specifically to a woman's jealousy, often with a slightly humorous or old-fashioned tone. The literal image is of a jealous woman sprouting horns like a demon.
彼女は彼が他の女性と話すたびに角を生やす。
She gets jealous every time he talks to another woman.
そんなに角を生
Don't get so jealous.