Definitions from Wiktionary (gack)

▸ verb:  (intransitive) To make a sharp, sudden sound in one's throat, such as before vomiting or while coughing, gagging, etc.
▸ verb:  To do something that causes a sharp, sudden sound in one's throat.
▸ verb:  (intransitive) To vomit, throw up.
▸ verb:  (transitive) To cough something up.
▸ verb:  (intransitive) To choke (be unable to breathe because of obstruction of the windpipe)
▸ verb:  (intransitive) To choke (experience tightness in one's throat as a result of strong emotion)
▸ noun:  (slang) Crystal meth.
▸ noun:  (slang) Powder cocaine.
▸ verb:  (of a bird) To call in response to disturbance.



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