Definitions

1. verb

to make or become longer; to extend or prolong

“The summer days will lengthen as we move closer to the equinox.”

2. verb

to increase the length of something, such as a piece of writing

“The professor asked the students to lengthen their essays to meet the requirements.”

3. verb

to make something seem longer or more extensive than it actually is

“The politician lengthened the list of his achievements to impress the voters.”