Flak/flæk/ Definition 1 of 2Pro Tip 1/3Figurative Usage Used metaphorically to describe verbal criticism or attacks, not physical ones. After his presentation, John faced flak from his colleagues. Pro Tip 2/3Negative Connotation Implies the criticism received is harsh and possibly overwhelming. She received flak for her unpopular decision. Pro Tip 3/3Informal Context Commonly used in casual or informal settings; less likely in formal texts. He's going to get flak for being late again.