Slack meaning: Definition of slack adjective in

Definition of slack adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. slack meaning, definition, what is slack: hanging loosely, or not pulled tight: Learn more. Master the word "SLACK" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. Slack can mean loose, negligent, slow, or a mixture of coal fragments. It can also be a noun for a loose part, a period of decreased activity, or a type of coal.