The act of becoming blended together - mixing.

Commingling is the breach of trust when funds someone holds for a client is mixed with own funds. Concerns are how profits/losses should be distributed and also what happens if bankruptcy occurs.

jingling, mingling, shingling, tingling, commingling, intermingling

an illegal practice that occurs when an agent mixes personal funds with the insured's or insurer's funds.

That is the correct spelling of the word mixing(commingling, adding together).