Breaking a dike means that water overflows the top of the dike, gradually taking away the soil built by the dike, and then the dike body becomes thin and soft, which can't stop the upstream water. A dike breach is called a dike breach (this is a natural factor).
There is also the artificial breach of the dike, which is to protect most interests and sacrifice local interests. When the flood comes, the dike will be dug as needed to let the flood enter the predetermined flood storage and detention area.
In addition, breaking the bank is also used as a metaphor, such as tears breaking the bank and thoughts breaking the bank, indicating that tears or thoughts can't be cleaned up like the bank being washed away by water.
Extended data:
River breach refers to the phenomenon that the water level in the basin rises sharply due to heavy rain, snowmelt, icing, storm surge and other reasons. After the water overflows the top of the dam, it gradually takes away the earth that built the dam, and then the dam becomes thinner and softer, which can't stop the upstream water, causing the river to wash away the dam.
References:
Break the dike-Baidu Encyclopedia