noun, noun or participle which takes 'suru', transitive verb, intransitive verb
rapid expansion; rapid growth; sharp increase
Used for sudden, large-scale growth or spread in business, scale, influence, or physical extent. Can be used both transitively and intransitively.
会社の海外事業が急拡大した。
The company's overseas operations expanded rapidly.
感染が
Prevent the infection from spreading rapidly.