漫游
màn yoú · HSK 7
to travel around
🌍 漫 (free/overflow) + 游 (swim, wander) = roam freely; also phone roaming
漫 — water radical 氵 + 曼 màn (phonetic)
漫 is a phono-semantic compound: the water radical 氵 gives the meaning and 曼 supplies the sound. It originally described water overflowing or spreading without bounds, and from that came extended senses like 'free, unrestrained, aimless,' as in 漫步 'to stroll' or 浪漫 'romantic.'
游 — water radical 氵 + 斿 (banner/streamer)
游 combines the water radical 氵 with 斿, which depicts a banner streaming in the wind. The original sense was a flag fluttering or floating, extended to drifting on water, swimming, and wandering. Today it commonly means to swim, travel, or roam.