潮
しお · shio · JLPT N1 · noun
tide
🌊 Water radical 氵 + 朝 (morning, gives the sound): water that rises and falls daily
The 朝 part supplies the sound (ちょう), and the water radical marks it as sea-related. Tides rise and fall about twice a day.
潮 — water 氵 + morning 朝
潮 is a semantic-phonetic compound. The water radical 氵 gives the meaning (tide, sea water), while 朝 (morning) supplies the sound. Originally it referred to the morning tide, later broadened to mean tides in general and, by extension, currents or trends.