Definitions from Wiktionary (squawk)

▸ noun:  A shrill noise, especially made by a voice or bird. If made by a bird, it typically signals discomfort or anger; a yell, scream, or call.
▸ noun:  (aviation) A four-digit transponder code used by aircraft for identification or transmission of emergency signals.
▸ noun:  (informal) A complaint or objection.
▸ noun:  (aviation) An issue or complaint related to aircraft maintenance.
▸ noun:  The American night heron.
▸ noun:  (programming, informal) A warning message indicating a possible error.
▸ verb:  To make a squawking noise; to yell, scream, or call out shrilly.
▸ verb:  (slang, intransitive) To speak out; to protest.
▸ verb:  (slang, intransitive) To report an infraction; to rat on or tattle; to disclose a secret.
▸ verb:  (programming, intransitive, informal) To produce a warning message, indicating a possible error.
▸ verb:  (aviation) To set or transmit a four-digit transponder code. (Normally followed by the specific code in question.)
▸ verb:  (US, slang, dated) To back out in a mean way.
▸ Also see squawk

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