深爪

1. Origins, structure, and basic meaning

• Structure: The noun and する expression 深爪 (ふかづめ) means cutting a fingernail or toenail painfully too short.
• Basic usage: The resulting condition is 深爪になる, while prevention appears in 深爪をしないように.

2. Common pitfalls and similar expressions

• Cutting a nail too short
  • It does not mean the nail grows deep; it means trimming too close to the skin.