Deviation from the front refers to the brush gesture when writing brush strokes in calligraphy.
The source
Yuan Li Puguang's Eight Methods and Eight Solutions of Yong Zi: "Those who are biased should not make their strokes correct, and those who are positive should not make their strokes biased."
The 17th time in the Mirror Flower Garden: "If you just make this deviation, I'm afraid you will get worse and worse, and you won't be able to make progress!" Ouyang Shan's "The Struggle" may or may: "But this man likes to be biased and talk with his mouth open. Look at that strange energy. He almost scared people to death!"