1. people who inform on others, especially to authorities
Usage: informal; often derogatory
2. young pigs that make high-pitched sounds

Examples

• The gang members were suspicious of potential squealers in their group.
• Nobody likes squealers who tell the teacher about every small rule violation.
• The farmer separated the squealers from their mother after weaning.
• The detective relied on information from squealers to solve the case.
• The barn was full of noisy squealers running around their pen.
• He was labeled as one of the squealers after cooperating with police.