寸すん秒びょう

noun

a moment; an instant

A very short span of time, literally 'a sun (寸) second'. Extremely rare and literary; not used in everyday speech. Modern equivalents include 一瞬 (いっしゅん) or 瞬間 (しゅんかん).

• 寸すん秒びょうを争あらそう事じ態たいだ。

  It's a situation where every moment counts.