Definition
To clench your hand into a fist and move it back and forth in the air, typically to express anger or a threat.
He shook his fist at the sky in anger when he discovered his car had been scratched.
The old man shook his fist at the children playing on the lawn, telling them to be quiet.
During the game, the spectators began to shake their fists at the referee when he made a call against their team.