Clock up Definition 1 of 3Pro Tip 1/3Large Numbers Typically used when referring to high numbers or achievements. She clocked up over 10,000 followers on social media. Pro Tip 2/3Time Investment Often implies a considerable amount of time has been invested in an activity. I've clocked up countless hours studying for exams. Pro Tip 3/3Positive Achievement Usually signifies a positive sense of accomplishment. Our team clocked up another win this season.