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tr. & intr.v. stiff·ened, stiff·en·ing, stiff·ens
To make or become stiff or stiffer.

stiff′en·er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. the act or process of becoming stiff
2. a material or substance used to stiffen something
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.stiffening - the act of becoming stiff; "stiffening his shoulders, he prepared to advance"
procedure, process - a particular course of action intended to achieve a result; "the procedure of obtaining a driver's license"; "it was a process of trial and error"
2.stiffening - the process of becoming stiff or rigid
natural action, natural process, action, activity - a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"
rigor mortis - muscular stiffening that begins 2 to 4 hours after death and lasts for about 4 days
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
مادَّةٌ تُصَلِّب


nEinlage f
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


(stif) adjective
1. rigid or firm, and not easily bent, folded etc. He has walked with a stiff leg since he injured his knee; stiff cardboard.
2. moving, or moved, with difficulty, pain etc. I can't turn the key – the lock is stiff; I woke up with a stiff neck; I felt stiff the day after the climb.
3. (of a cooking mixture etc) thick, and not flowing. a stiff dough.
4. difficult to do. a stiff examination.
5. strong. a stiff breeze.
6. (of a person or his manner etc) formal and unfriendly. I received a stiff note from the bank manager.
ˈstiffly adverb
ˈstiffness noun
ˈstiffen verb
to make or become stiff(er). You can stiffen cotton with starch; He stiffened when he heard the unexpected sound.
ˈstiffening noun
material used to stiffen something. The collar has some stiffening in it.
bore/scare stiff
to bore or frighten very much.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
References in classic literature ?
As every one knows, these same hogs' bristles, fins, whiskers, blinds, or whatever you please, furnish to the ladies their busks and other stiffening contrivances.
To-night these thousand slept their healthy sleep, to-morrow they, and many others with them, ourselves perhaps among them, would be stiffening in the cold; their wives would be widows, their children fatherless, and their place know them no more for ever.
Forgotten, save once, when old One Eye stopped for a moment to lick his stiffening wounds.
Researchers found that even those drinking up to 25 cups of coffee a day were no more likely to have stiffening of arteries than those who drank less than one cup a day.
'We want the FG to intervene pro-actively with a view to giving the desired impetus to local governments to enable them fill the gap in governance and enjoy the flexibility of delivering the goods to the locals unshackled, free from the stiffening strangulation by the state governments,' he noted.
Is there a point where vigorous exercise leads not to better health but to stiffening of heart muscle, aortic dilation (stiffening of the major blood vessel, the aorta), and coronary artery hardening?
Aortic stiffening was then assessed using a Vicorder device to measure carotidfemoral pulse wave velocity - the speed at which the arterial pulse propagates through the circulatory system.
Senior author of the study, John Deanfield who is a professor at the UCL Institute of Cardiovascular Science, said, "we found that in this large contemporary British cohort, drinking and smoking in adolescence, even at lower levels compared to those reported in adult studies, is associated with arterial stiffening and atherosclerosis progression," adding, "however, we also found that if teenagers stopped smoking and drinking during adolescence, their arteries returned to normal suggesting that there are opportunities to preserve arterial health from a young age."
Variations in the ratio of cable rigidity to girder stiffening may result in a reduction of the vertical displacements of the bridge and assist in providing rigidity for the complete structure.
While exercising for about two to three days a week for about 30 minutes may be sufficient to minimise stiffening of middle-sized arteries, exercising for about four to five days a week is required to keep the larger central arteries youthful,health news reported.
Exercising four to five times a week is necessary to stop the main arteries to the heart from stiffening up, research suggests.