成熟

1. Origins, structure, and basic meaning

• Structure: 成熟(せいじゅく) means becoming fully grown or ripe, or developing into a well-formed state.
• Basic usage: It is used for ripening fruit and for a plan developed through discussion.

2. Common pitfalls and similar expressions

• Literal ripening and a metaphor
  • 果実が成熟する means that fruit ripens.
  • 計画が成熟してきた figuratively means that a plan has gradually developed; てきた marks the change leading up to the present point.