To cry with a sharp, shrill, prolonged sound, as certain animals do, indicating want, displeasure, or pain.

A shrill, sharp, somewhat prolonged cry.

A high-pitched noise that indicates that brakes might need to be inspected for excessive wear.

a little less scary than a scream

confess to a punishable or reprehensible deed, usually under pressure

Can be caused by a build-up of debris on a guide or head. Sometimes a cleaning of the offending surface will eliminate the squeal. Squeal is also caused by the tape having poor lubrication or losing its lubrication with age. A solution is to overcoat a tape with a lubricant solution, which will eliminate the squeal so a copy can be made.

To turn informer; to betray a secret.