As a Noun: 1. Time that you spend at your job in addition to your normal working hours. English = overtime. As Modifier: 1. Used after a verb (action) sign to mean the action takes place over several hours making it take longer than is usual. Idiomatic English = hour by hour, round the clock, around the clock. 2. Used after the sign work to mean the work is in addition to your normal working hours. English = overtime.