Isn't

//ˈɪz.ənt// noun, verb, slang

Definitions

Noun
  1. 1
    Something or someone that is defined by the lack of the characteristic being discussed. colloquial, nonstandard

    "The most obvious recommendations for Joe Biden are a succession of “isn’ts.” He isn’t Donald Trump. He isn’t Bernie Sanders. He isn’t angry, bigoted, cruel, demagogic, erratic, frightening or gross. He isn’t going to drive Americans to distraction or the country into a ditch."

Verb
  1. 1
    Contraction of is + not (negative auxiliary). abbreviation, alt-of, contraction

    "Nice day, isn't it?"

Etymology

Etymology 1

From is + -n't.

Etymology 2

From is + -n't.

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