脅かす

1. Origins, structure, and basic meaning

• Structure: 脅かす(おびやかす) means endangering safety or a stable condition.
• Basic usage: It describes a suspicious call threatening a family's peace or an environmental change threatening island life.

2. Common pitfalls and similar expressions

• Intention and the resulting threat
  • A natural change such as the example's 海面の上昇 can be the subject. 脅かす can focus on the danger to safety or daily life rather than on a deliberate intention to frighten someone.