度忘れ

どわすれ
lapse of memory
forget for a moment

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どわすれ【度忘れ】

a lapse [slip] of memory; a sudden failure to remember something one knows well.

～する forget (for the moment); 〈事が主語〉 escape one's memory; slip one's mind.

●私はよく度忘れする. I often forget something I know very well.

・それをちょっと度忘れした. I can't call it to mind this minute. | It's slipped my mind for the moment.