godan verb (-mu)
Literal physical act of hoisting something onto one's back and carrying it. Often implies a heavy or bulky load.
大きなリュックを背負い込んで山道を歩いた。
I walked along the mountain path carrying a large backpack on my back.
godan verb (-mu)
take on a burden
Figurative use: to voluntarily or unavoidably take on a heavy burden such as debt, responsibility, or a problem, often with a sense of being weighed down.
彼は多額の借金を背負い込んでしまった。
He ended up shouldering a huge amount of debt.
会社の失敗の責任を一人で背負い込む必要はない。
You don't have to take on the responsibility for the company's failure all by yourself.