Break
In the dirt you place a cross and surround it with a net made of clothes to keep it safe, but this net tends to break. Of course it breaks, it's just some clothes you tied together.
かい
こわ
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You realize what keeps making your net break are kayaks (かい). The cross and net are right next to a river trail that kayakers do their kayaking in, and every time they go by their paddles smack into your net and break it.