Main Entry: slack·en

Pronunciation: \ˈsla-kən\

Function: verb

Inflected Form(s): slack·ened; slack·en·ing \ˈsla-k^ən-iŋ\

Date: 14th century

transitive verb 1 : to make less active : slow up <slacken speed at a crossing>
2 : to make slack (as by lessening tension or firmness) <slacken sail>intransitive verb 1 : to become slack or slow or negligent : slow down
2 : to become less active : slack

synonyms see delay