存分

1. Origins, structure, and basic meaning

• Structure: 存分 is read as ぞんぶん and means doing something to one's heart's content or bringing an ability or result fully into play.
• Basic usage: Use 存分に遊ぶ for playing to one's heart's content and 存分に発揮する for demonstrating an ability or result fully.

2. Common pitfalls and similar expressions

• Difference between 存分 and 十分
  • The former strongly suggests acting to full satisfaction or using all of one's ability, whereas the latter broadly indicates that a necessary degree is sufficient.