A lie is when you don't tell the truth.
If we leave aside the lie that is an untruth, most meanings of lie are related.
How common is "snot"?
Word snot is considered rare in modern English.
It appears most frequently in fiction texts and less often in other writings.
(informal, uncountable, sometimes slightly vulgar) Mucus, especially mucus from the nose.
(slang, countable) A contemptible child.
(slang, obsolete) A mean fellow.
(Northern England, dialectal) The flamed out wick of a candle.
(US ?, figurative, informal) A blemish or encumbrance that one exercises out of something.
booger