Definition (full): a cord, for, measuring, a rule, a rim, a musical string, accord
Strong's Exhaustive Concordance
Or qav {kawv}; from qavah (compare qaveh); a cord (as connecting), especially for measuring; figuratively, a rule; also a rim, a musical string or accord -- line. Compare qav-qav.
KJV: And I will stretch over Jerusalem the line of Samaria, and the plummet of the house of Ahab: and I will wipe Jerusalem as a man wipeth a dish, wiping it, and turning it upside down.
NASB: 'I will stretch over Jerusalem the line of Samaria and the plummet of the house of Ahab, and I will wipe Jerusalem as one wipes a dish, wiping it and turning it upside down.
KJV: Also he made a molten sea of ten cubits from brim to brim, round in compass, and five cubits the height thereof; and a line of thirty cubits did compass it round about.
NASB: Also he made the cast metal sea, ten cubits from brim to brim, circular in form, and its height was five cubits and its circumference thirty cubits.