Lying

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Old English licgan, of Germanic origin; related to Dutch liggen and German liegen, from an Indo-European root shared by Greek lektron, lekhos and Latin lectus ‘bed’.

wiktionary

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lie(“to  rest in a  horizontal position”) +‎  -ing. 

lie(“to  intentionally give false information”) +‎  -ing. 

etymonline

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lying (n.1)

"reclining," early 13c., verbal noun from lie (v.2) "to recline." Lying-in "a being in childbed" is attested from mid-15c.

lying (n.2)

"untruthfulness, falsehood," c. 1300, "the telling of lies," verbal noun from lie (v.1) "to tell an untruth."

lying (adj.1)

"being prostrate," late Old English, present-participle adjective from lie (v.2) "to recline."

lying (adj.2)

"untruthful," early 13c., present-participle adjective from lie (v.1) "to tell an untruth." Related: Lyingly.