lengthen
1. [ verb ] make longer
Examples:

"Lengthen this skirt, please"

Related terms: shorten increase elongate prolong
2. [ verb ] become long or longer
Examples:

"In Spring, the days lengthen"

Related terms: shorten grow
Similar spelling:   lengthened
  length
  lengthening
  lengthy
  lengthwise
  lengthiness
  lengthily
  lengthways