1. a person who informs on others, especially to authorities
Usage: informal
2. a young pig

Examples

• Nobody likes a squealer who tells the teacher about every small rule violation.
• The gang was caught because one member turned squealer.
• The farmer counted twelve squealers in the pen with their mother.
• The little squealer followed its mother around the barnyard.
• He was branded a squealer after reporting his classmates to the principal.
• The sow protected her squealers from the cold weather.