死因

1. Origins, structure, and basic meaning

• Structure: 死因 is read as しいん and means “cause of death”.
• Basic usage: It denotes investigating a cause of death and a detective questioning a victim’s cause of death.

2. Common pitfalls and similar expressions

• 死因を調べる / 死因に疑問を抱く
  • Use 死因を調べる for what is investigated and 死因に疑問を抱く for what is questioned.