mnemonic (n.):
3. Something forgettable that helps you forget something memorable.
(Obviously includes (1) and (2).)

mnemonic (n.):
3. Something forgettable that helps you forget something memorable.
(Obviously includes (1) and (2).)
You know the feeling of having something on the tip of your tongue and losing it. A name, a face, the second line of a poem you have known for years. The gap is not ignorance: the thing is there, and you cannot lay your hand on it.