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carrying (someone) on one's back (esp. a child); piggyback ride
relying on (someone); being (financially) dependent on
母は疲れた子供を負んぶして帰った。
The mother carried the tired child on her back and went home.
祖父に負んぶされた記憶が今も残っている。
I still remember being carried on my grandfather's back.
負んぶ紐を使って赤ちゃんを背負った。
I carried the baby on my back using a carrying strap.