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Definition of Gack
1. Interjection. (often repeated several times) The sound of a cat coughing up a hairball. ¹
2. Interjection. Also used of similar noises, particularly one made to show disgust or disapproval. ¹
3. Verb. (intransitive) To make a 'gack' noise. ¹
4. Verb. (transitive) To expectorate a hairball. ¹
¹ Source: wiktionary.com