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Definition of Slack off

Babylon English Dictionary

shirk one's duty, fail to fulfill one's obligations
Slack off Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

slack off
slackening n : an occurrence of control or strength weakening; "the relaxation of requirements": "the loosening of his grip"; "the slackening of the wind" [syn: relaxation, loosening]

WordNet 2.0

1. become less in amount or intensity; "The storm abated"; "The rain let up after a few hours"
(synonym) abate, let up, slack, die away
(hypernym) decrease, diminish, lessen, fall
Slack off Definition from Business & Finance Dictionaries & Glossaries
Glossary of petroleum Industry
to lower a load or ease up on a line. A driller will slack off to put additional weight on the bit.