lengthen

v. make longer; become longer; stretch; further; extend

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Verb
1. make longer; "Lengthen this skirt, please"
(antonym) shorten
(hypernym) increase
(hyponym) prolong, protract, extend, draw out
2. become long or longer; "In Spring, the days lengthen"
(antonym) shorten
(hypernym) grow

v. prodloužit (se)

Czas. wydłużać (się)

(v. t.)
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.
  

(v. i.)
To become longer.