If you encounter the word lier somewhere, it's likely to be a misspelling of the word liar. ... But lier is a real word—it's just rarely used. It's also an agent noun, just like liar, but it comes from the other meaning of the verb lie—to rest in a horizontal position. Remember, that's lie, not lay.

What does Lier mean?

: one that lies (as in ambush) — compare liar.

How do you use lier?

When to use lier: Lier is also a noun for a person. However, it describes a person who is lying down or lying in wait to ambush someone. For example: The army has several liers near the border of the camp in case anyone tries to enter who shouldn't.