《太平广记·卷二百五十三·嘲诮一》
走出庭院，那人倒地不起，刘黑闼叫人问他怎么回事，那人说：偏坠。
走出至庭，又即倒地。令问之，又云： 偏檐。
Walking out of the courtyard, the man fell to the ground and could not get up. Liu Heita asked someone to ask him what was wrong. The man said: Oblique fall.