E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Line upon Line.
Admonition orinstruction repeated little by little (a line at a time). Apells said Nulla dies
sine line. A drawing is line upon line, an edifice is brick upon brick or stone upon stone.
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Line upon line, line upon line, here a little and there a little.Isaiah xxviii. 10.