spokenused to say that someone is doing something very well:
The band's really cooking tonight.
WORD FOCUS: cook WORD FOCUS: cook fry (in oil) boil (in hot water) bake (bread and cakes in an oven) roast (meat or vegetables in an oven) microwave (using a microwave oven) grill/broilAmerican English (using a grill) steam, toast, simmer, poach, barbecue, stir-fry, saute, chargrill raw (not cooked) rare (used about meat that has been cooked for a short time) well-done (used about meat that has been cooked for a long time)cook ➔cookbook, recipe, culinary
cook something ↔ up
1DFCto prepare food, especially quickly:
Every night he cooked up a big casserole.
2informalto invent an excuse, reason, plan etc, especially one that is slightly dishonest or unlikely to work:
the plan that Graham and Dempster had cooked up
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.