• 振動しんどう — vibration
• 振興しんこう — promotion, advancement
• 振作しんさく — bracing oneself, becoming encouraged
• 振舞ふるまう — to behave, to treat (to a meal)
• 振ふる — to shake, to swing
• 振ふられる — to be dumped (in love)
• 振袖ふりそで — long-sleeved kimono
• 不振ふしん — slump, stagnation

振 combines the hand radical 扌 with the phonetic part 辰 (シン), suggesting an action involving the hand — shaking, swinging, or moving something.

It is often used in words involving movement or emotional shifts, such as 振動 (vibration) or 振られる (to be dumped).

彼かれは 手てを 振ふって 別わかれを 告つげた。
He waved his hand to say goodbye.

この装置そうちは 振動しんどうを 感知かんちします。
This device detects vibrations.

“ふる” is used when physically shaking or swinging something, like a bottle or umbrella.
The on-yomi “シン” appears in compound words like 振動 (vibration) or 振興 (promotion).