Someone who is eccentric means they have unusual or odd behavior, this then relates to the origin of the word which is egocentric meaning self centered. This then also goes on to relate to "center" because a person is "self centered" or egocentric.
High egocentrism = eccentric = self CENTERED
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I believe you're referring to "A Raisin in the Sun, " right?? If so, these words might symbolize Walter's wife's lack of support for him.