lengthen

verb

length·​en ˈleŋ(k)-thən 

ˈlen(t)-

lengthened; lengthening

ˈleŋ(k)th-niŋ,

ˈlen(t)th-;

ˈleŋ(k)-thə- 

ˈlen(t)-

transitive verb

: to make longer

intransitive verb

: to grow longer

lengthener

ˈleŋ(k)th-nər

ˈlen(t)th-;

ˈleŋ(k)-thə- 

ˈlen(t)-

noun

Synonyms

• drag (out)
• draw out
• elongate
• extend
• outstretch
• prolong
• protract
• stretch

Choose the Right Synonym for lengthen

extend, lengthen, prolong, protract mean to draw out or add to so as to increase in length.

extend and lengthen imply a drawing out in space or time but extend may also imply increase in width, scope, area, or range.

extend a vacation

extend welfare services

lengthen a skirt

lengthen the workweek

prolong suggests chiefly increase in duration especially beyond usual limits.

prolonged illness

protract adds to prolong implications of needlessness, vexation, or indefiniteness.

protracted litigation

Examples of lengthen in a Sentence

The days lengthened with the approach of spring.

Proper care will lengthen the life of the engine.

lengthen a pair of trousers

Recent Examples on the Web

Moreover, working the long head emphasizes the eccentric portion of a move—the part when the muscle is lengthening under load—which is a more effective way to improve strength, power, and speed performance compared to traditional resistance training, according to research. —Jenny McCoy, SELF, 9 Apr. 2025

Chronic pessimism damages your attitude and your telomeres—the protective tips at the end of chromosomes, shortened by negative thoughts and lengthened by positive thoughts. —Bryan Robinson, Forbes.com, 4 Apr. 2025

Driving the news: The freeze-free growing season lengthened between 1970 and 2024 in nearly 90% of the 198 cities analyzed by Climate Central, a research and communications group. —Esteban L. Hernandez, Axios, 2 Apr. 2025

Jost noted that the council could stagger public hearings on the proposals on different weeks, which would lengthen the timeframe. —Frederick Melo, Twin Cities, 19 Mar. 2025

Word History

First Known Use

14th century, in the meaning defined at transitive sense

Rhymes for lengthen

• strengthen

Kids Definition

lengthen

verb

length·​en ˈleŋ(k)-thən 

ˈlen(t)-

lengthened; lengthening ˈleŋ(k)th-(ə-)niŋ 

ˈlen(t)th-

: to make or become longer

lengthener

ˈleŋ(k)th-(ə-)nər 

ˈlen(t)th-

noun