[lengk-thuhn, leng-, len-]
verb (used with object)
to make longer; make greater in length.
verb (used without object)
to become greater in length; grow long or longer.

1490–1500; length + -en1

lengthener, noun
outlengthen, verb (used with object)
unlengthened, adjective

1. elongate, draw out. Lengthen, extend, stretch, prolong, protract agree in the idea of making longer. To lengthen is to make longer, either in a material or an immaterial sense: to lengthen a dress. To extend is to lengthen beyond some original point or so as to reach a certain point: to extend a railway line by a hundred miles. To stretch is primarily to lengthen by drawing or tension: to stretch a rubber band. Both prolong and protract mean especially to lengthen in time, and therefore apply to intangibles. To prolong is to continue beyond the desired, estimated, or allotted time: to prolong an interview. To protract is to draw out to undue length or to be slow in coming to a conclusion: to protract a discussion.

1. shorten.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lengthen (ˈlɛŋkθən, ˈlɛŋθən)
to make or become longer

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

early 16c., from length.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It can lengthen to reach the far corners of the sink.
Cancers cells do lengthen their telomeres to survive and thrive, but those are
  not normal cells and are already cancer cells.
All that will do is burn your lips and lengthen the time it takes for the
  now-brewed tea to be drinkable.
The key is that you're using your adductor or inner thigh muscles to properly
  lengthen the abductors.
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