When he didn't get the pay raise he was expecting, he had to take another job to 'pick up the slack'. [=to make up for the money he was not making]
The manager has to 'take up the slack' when employees don't do their jobs correctly.
We left some 'slack' in the budget so that we can hire more people if we have to.
(..) - Wireless webcams. Wave hello. The monster truck is out of Austin, Texas... ...and the blue Viper is being operated from suburban Tel Aviv. You may wanna put on slacks. What? Ew! Stop it. No. Leave me alone. - Who's running the red Corvette? - That would be me. You know, in the future, (..)2008 TvShow: The Big Bang Theory Title: The Cooper-Hofstadter Polarization Season: 1 Episode 9