lengthen \length"en\ -'n, v. t. imp.  p. p. lengthened
   -'nd; p. pr.  vb. n. lengthening -'ni^ng.
   to extent in length; to make longer in extent or duration;
   as, to lengthen a line or a road; to lengthen life; --
   sometimes followed by out.
   1913 webster

         what if i please to lengthen out his date. --dryden.
   1913 webster
see also:
lengthened lengthening 

lengthened
     adj : drawn out or made longer spatially; "picasso's elongated don
           quixote"; "lengthened skirts are fashionable this
           year"; "the extended airport runways can accommodate
           larger planes"; "a prolonged black line across the
           page" syn: elongated, extended, prolonged
see also:
elongated extended prolonged 

33 moby thesaurus words for "lengthened":
   dragged out, drawn, drawn out, drawn-out, elongated, extended,
   interminable, languishing, lasting, lingering, long,
   long-continuing, long-drawn, long-drawn-out, long-pending,
   long-winded, marathon, overlong, prolongated, prolonged,
   protracted, pulled, spun out, spun-out, straggling, strained,
   stretched, stretched out, stretched-out, strung out, taut, tense,
   tight