一切經音義 33.7

33.7

瞬頃（上輸閏反呂氏春秋云萬世猶一瞬者是也說文瞬謂開闔目數搖也從目舜聲或從寅作瞚）。

瞬頃 (in the blink of an eye; the first character is 輸閏反; Lüshi Chunqiu states, 'Ten thousand generations are like a single blink', which is an instance of this; the Shuowen jiezi states that 瞬 means the frequent fluttering of opening and closing the eyes; it takes the 'eye' (目) radical with 舜 as phonetic; or written with 寅 as 瞚).