Sic/sɪk/ Definition 1 of 1Pro Tip 1/3Instructional Command Used to direct a dog's action in an assertive way; often linked with hunting or protection. The farmer would 'sic' his dogs on the trespassing fox. Pro Tip 2/3Colloquial Usage Commonly used in informal speech, not in professional or academic environments. "Just 'sic 'em, boy!' and the dog chased the thief away." Pro Tip 3/3Aggressive Context The command implies aggression; often used when immediate action is needed. As the burglar approached, she yelled to the dog, 'Sic him!'