Third-person singular simple present indicative form of shorten.(verb)
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Use "shortens" in a sentence
"C. elegans dauer development and life-span extension has been suggested based on studies showing that knockdown of bec-1 expression shortens the lifespan of the daf-2 (e1370)."
"I'm inclined to go with the newer model (yes, I understand it "shortens" at closer flocusing distances)."
"Retailers like contactless because it shortens queues at busy times and lowers cash handling costs."