There are several synonyms for the phrase "fails to recall." One commonly used synonym is "forgets," which means to be unable to remember something. Another synonym is "blanks," which refers to a situation where someone draws a blank and cannot remember something. Another option is "omits," which refers to intentionally or unintentionally leaving something out of memory or conversation. "Loses track of" is another synonym, signifying a situation where someone loses their memory or train of thought. Finally, "puzzles over" can be used to describe someone who is trying to remember something but cannot quite recall it. These synonyms can be useful in various situations to express a similar idea.