Literally - ward off, rollback, press and push. From Tai Chi Forms in the section called grasp the bird’s tail or grasp the sparrow’s tail. The following videos are from a Chen Style master and quite different from the Yang-influenced Taiji that I have been learning and teaching. For example Ward Off in Chen style is palm away, whereas in Yang style it is palm toward the face. The second video is a more detailed breakdown.   And a blog post from Graham Barlow probably going in to more detail than I probably wanted! [https://thetaichinotebook.com/2015/09/10/peng-lu-ji-an-grasping-the-birds-tail/](https://thetaichinotebook.com/2015/09/10/peng-lu-ji-an-grasping-the-birds-tail/) ## Postscript Edited, 29-Aug-2024. Peng, Lu, Ji and An are the first of the ‘four energies’. The remaining four are Tsai, Lieh, Zhou and Kao. 1. Ward-off: Peng corresponds to SKY, trigram yang yang yang. 2. Pull-back: Lu corresponds to EARTH, trigram yin, yin, yin. 3. Press: Ji corresponds to WATER, trigram yin yang yin. 4. Push: An corresponds to FIRE, trigram yang yin yang. 5. Grabbing (pull-down): Tsai corresponds to WIND, trigram yang yang yin. 6. Breaking (splitting): Lieh corresponds to THUNDER, trigram yin yin yang. 7. Elbowing: Zhou corresponds to LAKE, trigram yin yang yang. 8. Shouldering: Kao corresponds to MOUNTAIN, yang yin yin. From [https://taichinotebook.com/2014/11/15/eight-energies/](https://taichinotebook.com/2014/11/15/eight-energies/https://taichinotebook.com/2014/11/15/eight-energies/)