Other forms: overtimes
Overtime is the amount of time you work beyond your regular hours. If your boss asks you to work over 40 hours one week, that's overtime and you should demand extra pay.
You can use this word as a noun or an adjective, as in overtime pay or overtime hours. At some workplaces, working overtime earns you more than the normal hourly salary. In other cases, full time employees are expected to work overtime without any extra pay. In sports, overtime is when play goes longer than the usual time — more than nine innings in a baseball game, or more than a twenty-minute half in basketball, for example.