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slacken

[slak-uh n] /ˈslæk ən/
verb (used with object), verb (used without object)
1.
to make or become less active, vigorous, intense, etc.
2.
to make or become looser or less taut.
Origin
1570-1580
1570-80; slack1 + -en1
Related forms
unslackened, adjective
unslackening, adjective
Synonyms
1, 2. relax, loosen, slack, abate.
Antonyms
2. tighten, tense.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un slackened

slacken

/ˈslækən/
verb (often foll by off)
1.
to make or become looser
2.
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
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Word Origin and History for un slackened

slacken

v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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