A person who serves food from a dish, or a utensil for dishing out food; also slang for someone who dishes out gossip or trouble.
From 'dish' plus '-er' suffix (one who does something). The basic meaning goes back to dishes as serving vessels, with slang extensions appearing in 20th-century American English.
In old communal eating spaces, the 'disher' was a crucial role—controlling portions and serving order gave them surprising social power, something comedians still joke about today.
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