let off

The mother said she would let off her son washing the dishes if he could finish his assignment before supper.

November 5th is a day on which, traditionally, children are allowed, under proper supervision, to let off fireworks, to make a bonfire and burn on it the figure of a ragged dummy made of old clothes, straw, and—if possible—one of father's oldest hats.

The teacher let off the students early today.

The teacher let him off with a warning.