To make a squawking noise; to yell, scream, or call out shrilly.
To speak out; to protest.
To report an infraction; to rat on or tattle; to disclose a secret.
To produce a warning message, indicating a possible error.
To set or transmit a four-digit transponder code. (Normally followed by the specific code in question.)
To back out in a mean way.
Squawk, the sound of a squawk