Definition of smack adverb from the Oxford Advanced Learner's Dictionary



    BrE BrE//smæk//
    ; NAmE NAmE//smæk//
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  1. 1(North American English also smack-dab) exactly or directly in a place It landed smack in the middle of the carpet. She kissed me smack on the lips.
  2. 2with sudden, violent force, often making a loud noise The car drove smack into a brick wall. He hit me smack in the mouth.
  3. Word Originadverb mid 16th cent. (in the sense ‘part (one's lips) noisily’): from Middle Dutch smacken, of imitative origin; compare with German schmatzen ‘eat or kiss noisily’.
See the Oxford Advanced American Dictionary entry: smack