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lengthen

[lengk-thuh n, leng-, len-] /ˈlɛŋk θən, ˈlɛŋ-, ˈlɛn-/
verb (used with object)
1.
to make longer; make greater in length.
verb (used without object)
2.
to become greater in length; grow long or longer.
Origin
1490-1500
1490-1500; length + -en1
Related forms
lengthener, noun
outlengthen, verb (used with object)
unlengthened, adjective
Synonyms
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.
Antonyms
1. shorten.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for out lengthen

lengthen

/ˈlɛŋkθən; ˈlɛŋθən/
verb
1.
to make or become longer
Derived Forms
lengthener, noun
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 out lengthen

lengthen

v.

late 14c., from length + -en (1). Related: Lengthened; lengthening. Earlier verb was simply length (c.1300).

Online Etymology Dictionary, © 2010 Douglas Harper
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