laugh someone or something to scorn ridicule someone or something.

☞ This is a biblical idiom: see, for example, Job 12:4: 'I am as one mocked of his neighbour, who calleth upon God, and he answereth him: the just upright man is laughed to scorn' or Matthew 9:24: 'He said unto them, Give place: for the maid is not dead, but sleepeth. And they laughed him to scorn.'