spasm

When they fight for real, their bodies twist into spasms of outrage.

It’s happened often enough that scientists at the Mayo Clinic have a more formal definition for it—involuntary wrist spasms that can stem from a neurological condition called focal dystonia.

But that night, 10 minutes before the first pitch, another player was pulled from the lineup with back spasms and Martin, the A’s irascible manager, wrote Davis’ name in his place.

Although she was only referred for diagnosis when she was 18, she's been experiencing tics - involuntary spasms - since she was 12.

He and other scholars note similarities between the deployment of troops to American cities, widespread disillusionment with the Supreme Court, and spasms of political violence — especially from disaffected young men.