Definition
An ATC instruction directing a pilot to activate specific modes, codes, or functions on the aircraft transponder. For example, 'Squawk 0425' means set the transponder to reply on code 0425, and 'Squawk Ident' means press the IDENT button so the aircraft's return is highlighted on the controller's radar display.
Plain English
A controller's instruction telling the pilot what to set or press on the transponder so the aircraft shows up on radar in a specific way.
Context Anchor
Heard in radio instructions from air traffic control, usually when ATC assigns a transponder code or asks for a specific transponder function.
Derivation
The word comes from the World War II identification system nicknamed 'Parrot,' because it 'spoke back' when interrogated by radar. 'Squawk' carried over from that bird-call image and now simply means a transponder action commanded by ATC.
Why Pilots Care
Proper squawking lets ATC see your exact position and altitude, enabling safe separation from other traffic and legal operation in controlled airspace.
Intuition Check
“Squawk” does not mean to complain or talk loudly here. In ATC use, it means to set or use the transponder so ATC receives the requested electronic reply.
Example Sentence 1
Cleveland Center instructed us to 'squawk 4271,' so I dialed the new code into the transponder and confirmed it on readback.
Example Sentence 2
The controller requested the aircraft to squawk ident to verify its radar position.