noun, noun or participle which takes 'suru', intransitive verb
sudden rise; steep climb; sharp increase
General term for a rapid upward movement in value, position, or physical height. Used for prices, rankings, temperature, etc.
株価が急上昇した。
Stock prices rose sharply.
気温が急上昇して、真夏
The temperature shot up, making it a midsummer day.
noun, noun or participle which takes 'suru', intransitive verb
trending; going viral
Internet-specific use: a topic, hashtag, or video suddenly gaining massive attention online.
そのハッシュタグが急上昇している。
That hashtag is trending.