洒落る
しゃれる · shareru · JLPT N1 · verb-ichidan
to joke
洒 — water radical 氵 + 西 (xī, phonetic)
洒 is a phonetic-semantic compound: 氵 (water) gives the meaning 'to sprinkle/splash water,' while 西 hints at the sound. Originally it depicted scattering water to clean or moisten the ground, and the sense later broadened to 'spill' or 'scatter' in general.
落 — grass radical 艹 + 洛 (water 氵 + 各)
Originally written with the grass radical 艹 over 洛, depicting leaves falling from plants. 洛 serves as the phonetic component (giving the luò sound) while 艹 supplies the meaning of vegetation. The sense extended from 'leaves falling' to the general meaning of falling, dropping, or settling down.