As a Noun: 1. The day before today. English = yesterday. 2. The day before any given day; the previous day. As a Verb or Adjective: 1. To be the most recent period of time, event, or thing. Used immediately before a time sign such as 'night', 'week', 'month', 'year', or before event sign such as 'birthday', 'marriage'. English = (be) last. As Modifier: 1. Used at the beginning of a sentence or next to a verb sign to mean that the action took place yesterday or on a day before another particular day. English = yesterday, on the day before that, on the previous day.