Milk the clock

what is the meaning of 'Milk the clock' ?

In American football and basketball, there are numerous rules about when the referees can stop and start play. If you know these rules (and every coach knows them) you can run a stalling defense, as when you want to protect your lead in points by keeping the opponent from running a complete play. You milk the clock for minutes, even seconds, that keep the game from going anywhere except for the whistle that ends the half or whatever time period rules.
The expression is also used for employees who milk the time-clock for extra minutes of pay, or fewer minutes of work.
Ss