used to denote the means by which a door is bolted ( Nehemiah 3:3 ); a rock in the sea ( Jonah 2:6 ); the shore of the sea ( Job 38:10 ); strong fortifications and powerful impediments, etc. ( Isaiah 45:2 ; Amos 1:5 ); defences of a city ( 1 Kings 4:13 ). A bar for a door was of iron ( Isaiah 45:2 ), brass ( Psalms 107:16 ), or wood ( Nahum 3:13 ).

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.