Yester year is a term used to refer to the past or a previous time period. It is often used nostalgically or wistfully to refer to a time that has passed. While yester year is a commonly used term, there are many synonyms that can be used to convey the same meaning. Some of these synonyms include bygone days, days gone by, previous years, olden days, ancient times, former times, and days of yore. Each of these phrases can be used interchangeably with yester year to evoke a sense of nostalgia or longing for a past time period.