What is the origin of the idiom "slip one's mind" and when to use it?

The idiom "slip one's mind" likely originates from the notion of thoughts or information slipping away or escaping from one's conscious awareness or memory. It implies that something was forgotten unintentionally, as if it slipped through the cracks of one's mental processes. This expression is used when someone forgets something, typically something important, without intending to do so. It highlights the unintentional or accidental nature of the forgetfulness.