gack

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Interjection

1. (often, repeated several times) The sound of a cat coughing up a hairball.
2. A similar sound made to show disgust or disapproval.

Verb

gack (gacks, present participle gacking; past and past participle gacked)

1. (intransitive) To make a 'gack' noise.
2. (transitive) To expectorate a hairball.

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