ichidan verb, intransitive verb
intensify; get worse; develop into something serious
Describes a situation, emotion, or condition that escalates or becomes more severe, often with negative connotations. Commonly used with nouns like 症状, 病状, 怒り, 趣味.
See also: 高ずる
風邪が高じて肺炎になった。
The cold got worse and turned into pneumonia.
彼の趣味が高じて、ついに店を開いた。
His hobby developed to the point where he finally opened a shop.