A squeal (chillado) is a high sound or cry. A similar word is shriek. Squeal is also a verb, so people and animals squeak.
Examine these:
• The girl squealed (…chilló cuando vio a …) when she saw the chocolates.
• Mr. Morales braked hard and the tyres squealed (…pisó el freno a fondo y los neumáticos chirriaron).
• The pig was squealing (estaba chillando) for an hour.
There are phrasal verbs: “squeal to”, “squeal on”. This means that information is revealed, usually information that is understood to be private. Mortals sometimes squeal on somebody, or to somebody.
Contemplate these:
• Somebody squealed on us to the police (alguien nos ha delatado a la policía).
• One never squeals on one´s friends (no se delata a los amigos).