|v. t.||1.||To extent in length; to make longer in extent or duration; |
|v. i.||1.||To become longer.|
|Verb||1.||lengthen - make longer; "Lengthen this skirt, please"|
shorten - make shorter than originally intended; reduce or retrench in length or duration; "He shortened his trip due to illness"
|2.||lengthen - become long or longer; "In Spring, the days lengthen"|
shorten - become short or shorter; "In winter, the days shorten"