fling up (one's) arms

fling up (one's) arms

To toss or jerk one's arms upward, typically to convey some emotion. As the kids ran around the room shrieking, Mom just flung up her arms and shook her head. I can't hear what they're saying, but it looks like Dad just flung up his arms in anger, so that's not a good sign.
See also: arm, fling, up