Definition of senior moment in US English:

senior moment

noun

informal
  • A temporary mental lapse (humorously attributed to the gradual loss of one's mental faculties as one grows older).

    • ‘Let us assume that the information is in this bill, and that I have had a senior moment and not been able to see it or find out where it is.’
    • ‘I can't differentiate between senior moments and other lapses.’
    • ‘I tell you, I had a bit of a senior moment yesterday!’
    • ‘‘In a senior moment, the person cannot recall in a timely way the information that's there,’ says Cummings.’
    • ‘So, now that I've stopped laughing at Winston's senior moment, I should also point out that he's accusing the Herald of the wrong crime.’

Pronunciation

senior moment

/ˈsinjər ˈmoʊmənt/