トウ, す.く, す.かす, す.ける, とう.る, とう.す, とおる

transparent, permeate, filter, penetrate

JLPT1 G7 S10 F1035

# surpass + 辵 movement → *penetrate*/*pass through* in surpassing → *create a gap/space* → *opening* (← gap) → *look through* (← look through a gap) → *transparency* (← be able to look/see through). Also, *thin* (out), *empty out* and *be free/unoccupied*, as well as *watermark* (← mark made visible by transparency).

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