Meaning and Usage
"一昨日" (おととい) means "the day before yesterday." It is a common time expression used in everyday conversation to refer to two days before the current day.
Common Contexts
You will often hear "一昨日" when talking about recent past events, such as what happened two days ago in daily life, work, or social situations.
Collocations and Patterns
- 一昨日 + verb (e.g., 一昨日行きました) — to describe actions that happened the day before yesterday.
- 一昨日の + noun (e.g., 一昨日の天気) — to specify something related to the day before yesterday.
Register and Politeness
"一昨日" is neutral and can be used in both casual and formal contexts without issue.
Common Mistakes
Learners sometimes confuse "一昨日" with "昨日" (yesterday) or "先一昨日" (the day before the day before yesterday). Remember: 一昨日 is exactly two days ago.