Si Dai A male classmate who joined a school after you; Younger kung fu brother. Traditional Writing: 師弟 Audio Playerhttp://wingchunlexicon.com/wp-content/uploads/2017/01/SI1-DAI6-_mdash-Wing-Chun-Elements_-Glossary.mp300:0000:0000:00Use Up/Down Arrow keys to increase or decrease volume.