A person or thing that mixes different things together so that they become blended or hard to separate.
From commingle (from Latin com- 'together' + mingle 'mix'), combined with the agent suffix -er. The word evolved from Middle English mingle, derived from Old English mengan.
Commingling is why custodians of funds are legally required to keep client money separate—if they commingle funds, it creates a financial and legal nightmare that has ended many careers.
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