squeal

Squeal is a word with several related meanings centered on a high-pitched sound or an act of revealing information. As a noun, a squeal is a sharp, penetrating cry or whistle produced by animals such as pigs and mice, by young children, or by mechanical sources under strain. As a verb, to squeal means to emit such a sound, to cause something to produce a squeal, or to reveal information to authorities or others.

In the animal context, a squeal is a vocalization used for communication, distress, alerting others, or contact between individuals. Pigs are commonly associated with a distinctive squeal, but many small mammals and birds also produce similar cries.

In mechanical and technical contexts, squeal refers to a high-pitched whine or screech produced by brakes, belts, bearings, or audio equipment when parts vibrate or feedback occurs. Squeals can indicate wear, misalignment, improper installation, or electrical feedback, and they are often addressed through maintenance or adjustments.

In slang, to squeal means to report or inform on someone to authorities or to reveal secrets. A person who does this is sometimes called a squealer. This usage is informal and can carry a negative connotation in some social contexts.

In everyday language, squeal can also describe emitting a delighted or surprised cry, as in squealing with joy. In literature and media, it functions as an onomatopoeic term to convey a vivid, high-pitched sound.