Chagi is the Korean word for a kick in taekwondo. There are lots of kinds of chagi. 'Ap', 'yop', 'dwi', 'naeryo', 'bakat', 'cha chun bai', also 'horio'. These meaning: front, side, back, like axe, outer crescent, skipping, reverse turning. There are also many kinds of 'jireugi', which means punch. 'Jireugi ap', 'jireugi yop' - you begin to get the picture?