2 occurrences in 2 dictionaries

Reference: Plumbline, Plummet

Hastings

The latter is a diminutive of 'piumb,' from Lat. plumbum, 'iead,' and denotes the combined cord and weight, by suspending which against a wali it can be seen whether or not the latter is perpendicular. On the strength of Zec 4:10 (lit. 'the stone, the tin,' not 'iead'; cf. Authorized Version margin) it has been inferred that the Hebrew masons used a plumb-bob of iead, but the text of this passage is undoubtedly corrupt (Wellh., Marti, Nowack). The Hebrew plummet (2Ki 21:13; Isa 28:17) more probably consisted of a stone (Isa 34:11 AV, but RV 'plummet') suspended by a cord, the 'piumbline' of Am 7:7 ff., Cf. Arts and Crafts,

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Morish

The simple contrivance of a lump of lead, a stone, or other weight attached to a string, for testing whether a building or other erection is perpendicular. It is used symbolically for the exactness with which judgement was brought upon Israel. Israel had been built up by God as a wall with a plumbline, and with a plumbline it should be destroyed. Am 7:7-8: cf. 2Ki 21:13; Isa 28:17. In Zec 4:10, although it was a day of small things when the temple was rebuilt, the plummet was in the hands of Zerubbabel, and the Lord of hosts was supporting him.

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