This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 溭 is uncertain. It visually combines the water radical 氵 with 畟, but the original meaning and component function are unclear.
Since the meaning is unknown, focus on the shape: water 氵 beside 畟. Without a clear meaning, treat it as a character to recognize by its components.
For ショク, imagine a shock of water splashing over the right side 畟: shock -> ショク, and the water radical 氵 makes it wet.
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