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Rule of Thumb (The)

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A rough guess-work measure. Measuring lengths by the thumb. In some places the heat required in brewing is determined by dipping the thumb into the vat.

Rule of thumb. In the legend of Knockmany Fin, Mr. Coul says:—

“‘That baste Cucullin [is coming], … for my thumb tells me so.ʹ To which his wife replies: ‘Well, my Cully, donʹt be cast down… . Maybe Iʹll bring you better out of this scrape than ever you could bring yourself by your rule of thumb [referring to the pricking of the thumb].ʹ”—W. B. Yeats: Fairy Tales of the Irish Peasantry, p. 270.


Again, p. 274, Fin knew by the “pricking of his thumbthat the giant Cucullin would arrive at two oʹclock. In these cases the “rule of thumb” refers to the prognostics of the thumb, referred to by the witches of Macbeth. “By the pricking of my thumbs, something evil this way comes.”

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.

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Rue
Rue
Ruffe
Ruffian Hall
Rufus (The Red)
Ruggiero
Rukenaw (Dame)
Rule (St.) or St. Regulus
Rule, Britannia
Rule Nisi
Rule of Thumb (The)
Rule of the Road (The)
Rule the Roost (To)
Rum
Ruminate
Rumolt
Rump-fed
Rump Parliament
Rumpelstilzchen [Rumple-stilts-skin]
Rumping Dozen
Run