KanjiJLPT N2
Wink

wink, blink, twinkle

Mnemonic

An eagle's claw wearing a tiny crown and goggles swoops straight at your eye. You wink at the last possible instant—a split-second blink so fast the bewildered bird crashes into a wall, missing you entirely.
Additional thoughts
Picture the absurd eagle accessorized with crown and goggles diving at your face. Your eye's single fearless wink is so impossibly quick it outwits the attack—linking all four radicals to the fleeting instant of a wink.
Quick recall
A claw in a crown and goggles dives at your eye, but your fearless wink is faster.

Details

The keyword for 瞬 is wink. This kanji refers to the rapid blinking or twinkling of the eyes, capturing the briefest possible moment of closing and opening one's eyelids. By extension, it conveys the idea of an instant or a fleeting moment, as in something that happens in the blink of an eye. It emphasizes the extraordinary brevity and swiftness of a single eye movement.
On'yomi
しゅん
Kun'yomi
またた.く、まじろ.ぐ