A shrill noise, especially made by a voice or bird; a yell, scream, or call.

A four-digit transponder code used by aircraft for identification or transmission of emergency signals.

An issue or complaint related to aircraft maintenance.

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.