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 of telling a lie or falsehood.

Tending to tell lies, untruthful, mendacious

simple past and past participle of lye

Source: wiktionary.org