振 is built from the 扌 (hand (left)) and 辰 components.
It reads シン like 辰, as do 震, 娠, and 唇 — learn 辰 once and the family's reading comes with it.
A common word using 振 is 振る (ふる), meaning “to wave, to shake; to sprinkle; to cast (actor)”.
Don't confuse it with 娠, 震, 唇, and 辰.