IPA: /rɪˈɡriːn/
KK: /riˈgrin/
To restore or make something green again, often referring to plants or areas that have lost their greenery.
The city plans to regreen the park by planting new trees and flowers.
Past: regreened
Past Participle: regreened
Regreen → It is formed from "re-" (meaning again) and "green" (from Old English "grēne", meaning of the color of growing plants). The word "regreen" means to become green again or to restore greenery.
Think of something becoming green 'again' ('re-') — that's why regreen means to restore the green of nature.