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Definition of lengthen:

  1. To become longer.
  2. 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.


procrastinate, continue, abbreviate, reach, prolongate, proceed, drag, let out, shorten, delay, defer, protract, truncate, postpone, produce, cut, telescope, long, draw out, outstretch, contract, decrease.

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