泼
pō · HSK 5
to splash
💦 氵(water) + 发 (send out) = water sent out, i.e. splash
The 氵 radical marks water words; 发 means to send/issue. Together: water being sent forth — a splash or spill. The 'rough/brutish' sense comes from the same vigor — someone 泼辣 (pōlà) is splashy, bold, coarse.
泼 — water radical 氵 + 发 (fā, send out)
泼 is a semantic-phonetic compound: 氵 (water) gives the meaning, while 发 suggests the sound. Originally it depicted water being thrown or splashed out, which extended to mean 'to splash, spill, or pour out.' Today it also carries the figurative sense of being lively or rude/unreasonable.