半減

1. Origins, structure, and basic meaning

• Structure: 半減, read はんげん, means that an amount, duration, or degree is reduced to one half.
• Basic usage: It applies when machinery cuts working time in half or when rain takes away roughly half the enjoyment of a festival.

2. Common pitfalls and similar expressions

• A reduction to one half
  • It describes working time being reduced by half or enjoyment of a festival being halved by rain. The fraction is more specific than a general small decrease.