What does it mean to be blocked by a white tiger in geomantic omen?

White tiger is one of the four nights, which is shown in gossip. Specifically, these 28 huts are arranged from west to east, in the same direction as the movement of the sun and the moon.

The East is called Qinglong: Jiao Mujiao Kang Jinlong Nyctereute Fang Ri Rabbit Heart Moon Fox Tail Fire Tiger Basket Water Leopard;

In the south, Suzaku is called: Muan Jing Ghost Golden Sheep, Liu Tu, Xingri Horse, Zhang Yuelu, Winged Fire Snake, Water Worm;

In the west, it is called the White Tiger: the Golden Dog of the Tiger Wood Wolf Tower, the Stomach Soil, the Pheasant, and Alnilam, the fire monkey of Bi Wu Yue Gou;

Xuanwu north said: unicorn, golden bull, female earth bat, virtual sun rat, fierce moon swallowing room fire, pig wall water.

(Tortoise and snake are called Xuanwu)

When you say "white tiger is in the way", you mean you can't go west, or you will meet girls and so on. , but it is not clear which night made the white tiger.