I dreamt that I broke evenly the blade of the biggest knife in my house after I washed it with cold water and it was the second knife, the first one that I broke being one with a sharp blade and blue handle
Dreams can have various interpretations depending on the individual's life circumstances and emotions. But generally speaking, dreaming about breaking a knife could symbolize a desire to cut off or eliminate something or someone in the dreamer's life.
In this specific dream, breaking both knives evenly could indicate a sense of balance in the dreamer's desire to get rid of problematic situations or people in their life. The fact that the first knife broken had a sharp blade and a blue handle may indicate that this was a difficult decision to make, possibly related to a difficult relationship or project. The second knife being the biggest one in the house could suggest that the dreamer is facing a significant issue that requires a decisive action, but that they are capable of handling it.
The fact that you washed the knife with cold water is also interesting as water represents emotions in dreams. The use of cold water here might suggest that the dreamer is trying to distance oneself from the other person/situation and finding it difficult to deal with emotionally.
Overall, this dream could indicate that the dreamer is currently facing a difficult decision that they are capable of making despite the emotional challenges. It may also speak to a sense of wanting to cut out negativity or toxicity from their life.