What is the meaning of Lying?

present participle and gerund of lie (“to rest in a horizontal position”)

The act of one who lies, or keeps low to the ground.

present participle and gerund of lie (“to intentionally give false information”)

An act or telling a lie or falsehood; the practice of telling lies.

Tending to tell lies, untruthful, mendacious

simple past and past participle of lye

Source: wiktionary.org