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A person who actively opposes or is hostile to the protagonist.

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"first of all, each of you has a big sister. She's the one who bosses you around, and you just do what she tells you". (Plath 6).
The sorority leader is talking to the new members about their roles on what to do. Shes also talking about hows shes the one in charge and anything that she says they have to obey it. Shes explains it by saying that shes the big sister and you have to do what i tell you to.

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"Into the house,  gopher. There's a bed to be made and a room to be cleaned at the top of the stairs." (Plath 9). This shows that Bev is the antagonist towards Millicent as she constantly belittles her.

Bev, the older sister in the sorority for Millicent, is the main antagonist. She makes her do mundane tasks like doing her chores. Bev also belittles Millicent as she calls her gopher constantly instead of her name.

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"Then the girls had led her here, blindfolded still, through the corridors of Betsy Johnson's house and shut her in the cellar." (Plath 5).

For the last part of the initiation into the sorority, Millicent is put in a cellar, blindfolded, alone, and with an egg smashed on her head.

In order to join the sorority, Millicent has to take orders from her "big sister" to show that she's committed enough to join. She can't talk back, show any emotion, or talk to any boys during the initiation. Her big sister made her Charleston step and sing across the street, do her chores, survey people on a bus, and make her sit in a cellar blindfolded, alone, and with an egg on her head.