Mackerel/ˈmækrəl/ Definition 1 of 2Pro Tip 1/3Culinary Term Used frequently when talking about food, especially in recipes or on menus. Grilled mackerel is today's special. Pro Tip 2/3Common Metaphor Sometimes used metaphorically to describe something common or abundant. Ideas in his head were as plentiful as mackerel in the sea. Pro Tip 3/3Paired with Adjectives Often used with adjectives that describe its quality, like 'fresh', 'smoked', or 'pickled'. She prepared some pickled mackerel for the appetizer.