slack

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Related to slack off: roughshod, up to par

slack

1
1. 
a. a patch of water without current
b. a slackening of a current
2. Prosody (in sprung rhythm) the unstressed syllable or syllables

slack

2
small pieces of coal with a high ash content
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

slack

[slak]
(engineering)
Looseness or play in a mechanism, as the play in the trigger of a small-arms weapon.
(geology)
A hollow or depression between lines of shore dunes or in a sandbank or mudbank on a shore.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

slack

1. Coal of relatively fine size, usually not exceeding 2½ in. (6.35 cm) in diameter; often screenings.
2. Fitting loosely.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

slack

(operating system)
Internal fragmentation. Space allocated to a disk file but not actually used to store useful information.

slack

(jargon)
In the theology of the Church of the SubGenius, a mystical substance or quality that is the prerequisite of all human happiness.

Since Unix files are stored compactly, except for the unavoidable wastage in the last block or fragment, it might be said that "Unix has no slack".

See ha ha only serious.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

Slack

(1) See SLAAC.

(2) A popular workplace collaboration application from Slack Technologies (www.slack.com). Introduced in 2013 and originally developed as a tool for its own video game development, Slack lets people organize chat "channels" for projects, departments, groups of users, etc., all of which reside in a sidebar. Messages can also be made private, and files can be shared by dropping them into a channel.

Documents can be searched, and social media, cloud storage and other services can be plugged in to keep all communications in one place. Available as a freemium product, the paid versions offer many more features, including tech support, usage statistics and unlimited searching and service integration. See collaboration software.
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References in periodicals archive ?
But never were the children allowed to use the hard work all of them did as an excuse to slack off on their school work.
LUKE SHAW has revealed that Ole Gunnar Solskjaer gives the Manchester United players "a kick up the backside" if they slack off.
You don't get any chance to slack off and I enjoy that environment."
Although we are at the end of our tour, we cannot afford to slack off. It will be whoever fronts up on the day.
However, just as the promotional video warned, users should be careful not to slack off too much.
Palace have secured safety in the top flight but boss Tony Pulis insists they won't slack off in the final three games.
London, Mar 31 ( ANI ): Coffee has a "stimulant" effect on lazy people but has the reverse result on hard workers, making them slack off, a new study has suggested.
Live365.com offers streaming radio Internet programming if students want to slack off when they should be working.
'I'm certainly not going to slack off now, winning this medal has given me a real taste for success and made all the hard training worth while,' said Davies.
"We scored four and could have had a few more but I was really pleased with the fact that we didn't slack off after going two up.
Others' experiments with male-dominant species suggest that males slack off on parenting when they have evidence the chicks are not their own.
A former member of the Paul Sanasardo Dance Company, she encourages beginners to work just as hard as professionals, and she never allows professionals to slack off. Somehow, she finds a way to bring out the best in all her students, despite their varying skill levels and prior training.