せおう
to carry on one's back, to shoulder
The back takes the load and the load stays there for the whole of the walk. A child, round the town. Say せ, oh おう, that is heavy: せおう.
負う おう on its own is bearing a responsibility and 肩 かた is the shoulder itself. 背負う is putting a load on your back.
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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.