游

Left 氵 is the three-drops water radical - three abbreviated waves, the side-form of 水. Anchors the original sense of 游: 'to swim, drift on water'. From physical swimming came the abstract sense of roaming or touring (drifting from place to place). Same radical family: 河 river, 海 sea, 泳 swim, 漂 to drift.

Right 斿 supplies an exact phonetic match yóu. It originally pictured a child holding a flagpole with streamers flowing in the wind - pure visual of 'drifting'. So this is sound-plus-semantic: the banner's drift reinforces water-drift, both literal swimming and metaphorical roaming. The 斿 component is rare standalone but recognisable inside 游, 旅, 旌.