The phrase "more yesterday" refers to something that happened before or in the past. There are several synonyms that can be used to describe this term. One of the best synonyms for "more yesterday" is "previous." Other synonyms include "former," "prior," "earlier," and "elapsed." These words can be used interchangeably with "more yesterday" to convey a similar meaning. For example, instead of saying "I did that more yesterday," you could say "I did that earlier," or "I did that before." It's important to choose the right synonym in context to ensure that the meaning of the sentence is clear and easily understood.