負 combines the shell radical (貝), often symbolizing wealth, with a person (⺈) carrying or taking something on. It originally meant "to carry on the back," but its meanings extended to include "to lose" in competitive situations and "to bear" responsibility.

チームが試合しあいに負まけました。
The team lost the match.

彼かれは 責任せきにんを負おっている。
He is taking responsibility.