かかわる
to involve, to concern
The gate is what ties your side to theirs, and whatever stands on the other one is now your business too. The same can かか as 関係, and it costs わる you. His work touches the military: かかわる.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.