募る

1. Origins, structure, and basic meaning

• Structure: 募る, read つのる, joins the gathering or intensifying stem 募 with the verb ending る.
• Basic usage: 手伝う人を募る means recruiting people, while 不安が募る means a feeling growing stronger.

2. Common pitfalls and similar expressions

• Distinguishing meanings
  • The recruiting use takes people or proposals as an object, while in the intensifying use a feeling or state is the subject.