When someone is unable to remember something, they may say they are "failing to recollect." However, there are several other phrases that can be used to convey the same idea. These include "drawing a blank," "having a lapse in memory," "going blank," "can't think of," and "forgetting momentarily." Additionally, one might say they are "struggling to recall," "experiencing mental blocks," or simply "not able to remember." No matter how it's expressed, forgetting something can be frustrating, but knowing multiple ways to describe the experience can help in communicating the issue to others.