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from Latin pudibundus easily ashamed, bashful, modest, also shameful, from pudēre to make or be ashamed; cf. French pudibond (16th c. in Littré)
From: The Fyrst Boke of the Introduction of Knowledge Made by Andrew Borde
A Compendyous Regyment or A Dyetary of Helth
Edited by F. J. Furnivall, 1870
Chap. X. Dyetary, Water Should Not Be Drunk Alone.