What is another word for lengthen?
Pronunciation: [lˈɛŋθən] (IPA) 
Lengthen is a word that means to extend the length of something. There are many synonyms for this word that can be used to add variety to your writing. Some of the most common synonyms for lengthen include elongate, stretch, increase, protract, and expand. These words all have slightly different meanings, but they can all be used to describe the act of making something longer. Some other possible synonyms for lengthen include perpetuate, prolong, and broaden. By using synonyms for lengthen in your writing, you can add depth and nuance to your descriptions and make your writing more interesting to read.
