弓形

1. Origins, structure, and basic meaning

• Structure: 弓形 (ゆみなり) means a shape curved like a bow. Both examples use resultative or stative 弓形に.
• Basic usage: A thin moon appears 弓形に浮かぶ, while a heated board is deliberately 弓形に曲げた.

2. Common pitfalls and similar expressions

• Naturally appearing arc and deliberately formed arc
  • The same 弓形に marks an observed state in the first sentence and the result of a transitive action in the second. It does not mean the object is made from a bow.