Lay is often used where lie is considered standard, as in "I'm going to lay down for a quick nap." The use, which dates to the 14th century, troubled no one until the 18th, but since then, people who care about such things have tried to teach the rest of us that a person lies, not lays, down. Lay in the related use means "to place (someone or something) down gently in a flat position." It requires an object; there must be a thing or person being placed.
Lay it down.
It's time to lay the baby down for a nap.
Lie, on the other hand, does not require an object; instead, the one lying down is already in position or is moving or going to move to such a position on their own.
The cat lies there every morning.
You can lie down on the sofa.
The tenses of the verbs complicate things further. Lay becomes laid and laying
Verb (1)
the train tracks lie just over that hill
I left the book lying on the counter
paparazzi were lying in wait outside the restaurant, a well-known celebrity hangout Verb (2)
would I lie to you about that? Noun (2)
he wanted to deny the accusation, but he couldn't tell a lie
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Verb
Smith argued that economic concerns are where the battle for this year’s elections lies.—David Zimmermann, The Washington Examiner, 9 Feb. 2026 Efficient optimization lies at the heart of drug discovery, cryptography, urban planning, logistics, finance, and energy systems.—Rupendra Brahambhatt, Interesting Engineering, 8 Feb. 2026
Noun
Austrian Airlines brings the charm of the Alpine countryside to its Business Class, which features lie-flat beds and an onboard chef to put the finishing touches on your authentic menu.—Condé Nast Traveler, 6 Feb. 2026 Investigators considered Puig’s inability to remember the name a lie.—Steve Henson, Los Angeles Times, 6 Feb. 2026 See All Example Sentences for lie
Word History
Etymology
Verb (1)
Middle English, from Old English licgan; akin to Old High German ligen to lie, Latin lectus bed, Greek lechos