do verb 1.to perform (an act, duty, role, etc.): Do nothing until you hear the bell. 2.to execute (a piece or amount of work): to do a hauling job. 3.to accomplish; finish; complete: He has already done his homework. 4.to put forth; exert: Do your best. 5.to be the cause of (good, harm, credit, etc.); bring about; effect.