According to the Rhymes of the Broad Record (Guangyun), it is pronounced yu. According to the Collected Rhymes (Jiyun), it is pronounced zun, which is the same as the pronunciation for the word meaning to consult. The Rhymes of the Broad Record explains that the word refers to a lack of integrity. Additionally, according to the Collected Rhymes (Jiyun), it is pronounced sou. It is the same as the word for the sound used to urge on a dog. For a detailed explanation, see the entry for the word meaning to incite.