It's not an idiom, it's just an ordinary compound word, which means it has a powerful momentum, so the tiger here refers to the tiger. The Zodiac Tiger ranks third among the 12 Zodiacs, and belongs to Yin among the 12 branches. 3 am to 5 am is also called tiger time.
The tiger is the king of beasts, and the yin and the tiger are in harmony. The word "Yin" in Oracle Bone Inscriptions is like an arrow. The word "Yin" in Shuowen means "When the yang is rising, though people freeze to death, they will break through the ground", which is in line with the tiger's ferocity.
The worship of tigers should come from the totem worship of tigers in Chu culture. The tiger has always been worshipped by the Han people. It is a symbol of justice, courage and majesty. People in the Han Dynasty regarded the tiger as the king of beasts. The white tiger is a tiger that can only turn white in 500 years. It's sacred. Immortals often ascend to heaven by tigers. It's the beast of Zhenxi. Since the Han Dynasty, the tiger has been the favorite protector of the working people. After a long historical evolution and development, the cultural awareness of tiger worship has become an unchangeable cultural concept of the Chinese nation.
On the homestay culture of tigers;
People think that tigers are the protectors of children. Newborns should wash their bodies with tiger bones to get rid of diseases. The children are wearing tiger hats and shoes. It is still popular to give children tigers as toys during the Dragon Boat Festival. Cloth tigers should be brave.