noun
a male servant in a large house or estate whose duties include maintaining the household and serving meals
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The butler greeted the guests at the door and escorted them to the dining room.
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The butler always knows how to make a mean martini for the party.
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I heard the butler is the real MVP of this place, always fixing things behind the scenes.
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In a way, our immune system is like the butler of our body, always working to keep things in order.