蔓延

Verb

 * 1)  to spread; to extend

Noun

 * 1) spread of a disease
 * 2) rampancy of the growth of vines
 * 3) rampancy of a bad custom

Verb

 * 1) (for disease) to spread
 * 2) (for vines) to grow rampant
 * 3) (a bad custom) to be rampant