頃合い

1. Origins, structure, and basic meaning

• Structure: In 頃合い (ころあい), time 頃 and fit 合い combine to denote a suitable moment or degree.
• Basic usage: Although 頃合い ends in い, it is a noun meaning the right time or degree, not an i-adjective.

2. Common pitfalls and similar expressions

• 頃合い is a noun
  • 頃合いを marks what is judged, while 頃合いに marks reaching or acting at the suitable point.