slacken

[slak-uhn]

verb (used with or without object)

to make or become less active, vigorous, intense, etc.
to make or become looser or less taut.

Origin of slacken

First recorded in 1570–80; slack1 + -en1
Related formsun·slack·ened, adjectiveun·slack·en·ing, adjective

Synonyms for slacken

Antonyms for slacken

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for slacken

slacken

verb (often foll by off)

to make or become looser
to make or become slower, less intense, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for slacken
v.

early 15c., from slack (adj.) + -en (1). Related: Slackened; slackening.

Online Etymology Dictionary, © 2010 Douglas Harper