There are several synonyms for the phrase "failed to recall." Some of these include "didn't remember," "forgot," "slipped my mind," "blanked on," "couldn't recollect," and "didn't retrieve." Each of these phrases conveys the same idea of not being able to remember something. They can be used interchangeably depending on the context and situation. It is important to note that forgetting or failing to recall something is a common occurrence and should not be a cause for concern unless it happens frequently or interferes with daily life. Utilizing synonyms for "failed to recall" can help individuals express themselves more clearly and effectively in various settings.