rule of thumb

💡 Meaning

A general guideline based on practical experience rather than precise measurement.

정확한 측정 대신 실용적인 경험에 기반한 일반적인 지침을 의미해요.

🧠 Memory Hook

Carpenters, tailors, and builders historically used their thumb as a rough measuring tool when no ruler was available. It was not perfect, but it was close enough to work — a practical guideline from experience.