温める

1. Origins, structure, and basic meaning

• Structure: 温める(あたためる) means making an object or part of the body warm.
• Basic usage: It is used for heating cooled soup or warming cold hands.

2. Common pitfalls and similar expressions

• The change compared with 温まる
  • 手を温める describes the action of warming one's hands, while 手が温まる describes the hands becoming warm. The latter uses the intransitive verb 温まる(あたたまる).