Noah Webster's Dictionary (n.) One who lies down; one who rests or remains, as in concealment.

Multi-Version Concordance Lier (1 Occurrence) Ezra 8:31 Then we departed from the river Ahava on the twelfth day of the first month, to go unto Jerusalem: and the hand of our God was upon us, and he delivered us from the hand of the enemy and the lier-in-wait by the way. (ASV JPS YLT)