I.up [美 əp, 英 ʌp]副up often appears as the second element of certain verb structures in English (back up, pick up, sit up, etc). For translations, see the relevant verb entry (back, pick, sit, etc).
If live-streaming, publicly viewable camera feeds sprout up all over the world, there's a higher chance that people can hold each other more accountable.
Since that time, it has greatly expanded its existing settlements and allowed dozens of unauthorised outposts to sprout up, in some cases subsequently legalising them.