KanjiJLPT N2
Shake

shake, wave, wag, swing

Mnemonic

A hand reaches out to shake a sleeping dragon awake. Big mistake. The ground shakes, the walls shake, everything shakes as the furious beast thrashes its massive tail in every direction, swinging its body back and forth until the whole mountain trembles.
Additional thoughts
Picture the foolish hand poking the dragon's snout—then the violent full-body shaking that follows. The image of one tiny hand causing a dragon-scale earthquake locks the meaning in.
Quick recall
A hand tries to shake a dragon awake—everything trembles.

Details

The keyword for 振 is shake. This kanji conveys the action of shaking, swinging, or waving something back and forth, such as shaking one's head or waving a hand. It also carries extended meanings of brandishing,振ring off (rejecting), or assigning and distributing. Additionally, it can refer to振ration or振havior in the sense of one's manner or conduct.
On'yomi
しん
Kun'yomi
ふ.る、ふ.れる、ふ.るう