炎天下

1. Origins, structure, and basic meaning

• Structure: 炎天下 is read as えんてんか and is a noun for an outdoor setting under an intensely hot, blazing sun.
• Basic usage: Walking under the blazing sun appears in 炎天下を歩く, while working in that heat appears in 炎天下で作業する.

2. Common pitfalls and similar expressions

• Route を and activity location で
  • Use を for moving through that environment and で for carrying out work there.
• Difference from 晴天
  • Unlike the word for clear weather, this term emphasizes exposure to intense sunlight and heat.