to make a system or organization as efficient as possible by making sure that money, space, or people are fully used:
Without another contract to help pick up the slack, employees may face job losses.
to do something that needs to be done because someone else is no longer doing it
to make a rope tighter
part of a rope that is not stretched tight
money, space, people, or time that an organization or person has available, but is not using fully:
There is still some slack in the budget.
to allow someone to do something without criticizing them or making it more difficult:
Hey, cut me some slack, man, I'm only a few bucks short.
6 [uncountable] British English
very small pieces of coal