肩代わり

1. Origins, structure, and basic meaning

• Structure: 肩代わり(かたがわり) is a noun for taking over work or a burden that belongs to someone else.
• Basic usage: The burden takes を in patterns such as 仕事を肩代わりする and 借金を肩代わりする.

2. Common pitfalls and similar expressions

• Taking over a burden
  • The focus is stronger than simply helping: the person assumes duties or responsibility originally carried by someone else.
• Noun and verb use
  • It can stand as a noun or combine with する as 肩代わりする to describe the action.