挥手臂用英语该怎么说

To wave one's arms means to move them up and down, or back and forth, in a gesture that is often used to greet someone, signal for attention, or express excitement or enthusiasm. In Engpsh, you could say:

"I waved my arms to get his attention."

"She greeted us by waving her arms in the air."

"He was so excited that he couldn't help but wave his arms around."

You could also simply say "wave your arms" or "wave your arms around" to describe this action.