Topic: WAGES
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o‧ver‧time
[uncountable]
[uncountable]1BEW time that you spend working in your job in addition to your normal working hours COLLOCATIONS 
work/do overtime paid/unpaid overtime overtime payment/pay on overtime
six hours' overtime

work/do overtime paid/unpaid overtime overtime payment/pay on overtime
six hours' overtime2BEW the money that you are paid for working more hours than usual :
He earns £450 a week, including overtime.
He earns £450 a week, including overtime.3 to be very active :
As she put down the phone, her brain was working overtime.
His senses were working overtime.
be working overtime
informal
As she put down the phone, her brain was working overtime.
His senses were working overtime.4x-ref American English a period of time added to the end of a sports game to give one of the two teams a chance to win [= extra time British English]