verb (used with object), verb (used without object)
to make or become tight or tighter.

1720–30; tight + -en1

tightener, noun
overtighten, verb
retighten, verb
self-tightening, adjective
untighten, verb (used with object)

secure, anchor, fasten.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tighten (ˈtaɪtən)
1.  to make or become tight or tighter
2.  tighten one's belt to economize

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"to make tight," 1727; the earlier verb was simply tight, from O.E. tyhtan, from the root of tight.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It is no surprise that they have been the first to tighten.
But if some countries tighten too soon, this could derail the global recovery.
When oil markets tighten, another set of problems emerges.
The regime tends to tighten the screws when it feels edgy.
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