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 prolong in a Sentence
Additives are used to prolong the shelf life of packaged food.
High interest rates were prolonging the recession.
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DiCaprio extended his deepest condolences to Goodall’s family and urged others to support the Jane Goodall Institute and other conservation groups to prolong her legacy.—Chad De Guzman, Time, 2 Oct. 2025 If a shutdown is prolonged, SNAP funding could run out, potentially causing a delay or pause in benefits.—Marina Johnson, Louisville Courier Journal, 2 Oct. 2025 The department declined to elaborate on whether courts would continue operating uninterrupted if the shutdown is prolonged.—Noe Padilla, IndyStar, 1 Oct. 2025 National parks may close, and some federal assistance programs could be affected if the shutdown is prolonged.—Hadley Hitson, Nashville Tennessean, 1 Oct. 2025 See All Example Sentences for prolong
Word History
Etymology
Middle English, from Middle French prolonguer, from Late Latin prolongare, from Latin pro- forward + longus long
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